Halo: The Master Chief Collection (CN) achievements
12,236
(4,755)

Halo: The Master Chief Collection (CN)

4.6 out of 5 from 8 votes

There are a maximum of 479 Halo: The Master Chief Collection (CN) achievements worth 12,236 (4,755)

48 tracked gamers have this game, no one has completed it (0%)

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Halo: The Master Chief Collection (CN) Achievements

This is a rare achievementHalo 2: In The Oracle, find the holo-drone before the Heretic Leader activates it.
Unlocked by 5 tracked gamers (10% - TA Ratio = 3.09)  
Halo CE: Complete 343 Guilty Spark.
Unlocked by 19 tracked gamers (40% - TA Ratio = 1.58)  
This is a rare achievementCollect 3,000 campaign or playlist medals.
Unlocked by 22 tracked gamers (46% - TA Ratio = 1.47)  
Halo CE: Play Halo: CE on the 15th of any month.
Unlocked by 16 tracked gamers (33% - TA Ratio = 1.73)  
This is a rare achievementCollect 5,000 campaign or playlist medals.
Unlocked by 16 tracked gamers (33% - TA Ratio = 1.73)  
This is a rare achievementHalo CE: Complete a Halo: CE playlist.
Unlocked by 9 tracked gamers (19% - TA Ratio = 2.30)  
This is a rare achievementCollect 4,000 campaign or playlist medals.
Unlocked by 21 tracked gamers (44% - TA Ratio = 1.51)  
This is a rare achievementHalo 4: Play a game of Halo 4 on the 6th of any month.
Unlocked by 17 tracked gamers (35% - TA Ratio = 1.68)  
Collect 2,000 campaign or playlist medals.
Unlocked by 24 tracked gamers (50% - TA Ratio = 1.44)  
This is a rare achievementHalo 3: Complete the Halo 3 LASO Campaign playlist.
Unlocked by 5 tracked gamers (10% - TA Ratio = 3.09)  
Aficiando80 (20)
This is a rare achievementHalo 3: Complete three Halo 3 playlists.
Unlocked by 3 tracked gamers (6% - TA Ratio = 4.00)  
This is a rare achievementEarn a total of 2,500 Headshot medals in multiplayer.
Unlocked by 8 tracked gamers (17% - TA Ratio = 2.44)  
Airborne28 (10)
This is a rare achievementHalo CE: Launch a Warthog for at least 5 seconds and have it splatter an enemy.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo CE: Kill the first group of enemies on The Truth and Reconciliation without being detected.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
Collect 1,000 campaign or playlist medals.
Unlocked by 28 tracked gamers (58% - TA Ratio = 1.30)  
This is a rare achievementHalo CE: Beat the par time on The Maw.
Unlocked by 3 tracked gamers (6% - TA Ratio = 4.00)  
This is a rare achievementHalo 2: Collect the Master Chief toy in Delta Halo.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo 2: Spot the hippo on the walls of Headlong in classic multiplayer.
Unlocked by 10 tracked gamers (21% - TA Ratio = 2.19)  
Annual23 (10)
This is a rare achievementHalo 3: Complete Halo on 4-player Legendary co-op, with Iron Skull, and everyone in Ghosts.
Unlocked by 9 tracked gamers (19% - TA Ratio = 2.30)  
This is a rare achievementHalo 2: Beat the par score on every Halo 2 level.
Unlocked by 3 tracked gamers (6% - TA Ratio = 4.00)  
This is a rare achievementHalo 2: Beat the par time on The Great Journey.
Unlocked by 3 tracked gamers (6% - TA Ratio = 4.00)  
Arrival8 (5)
Halo CE: Activate Terminal 1 on The Pillar of Autumn.
Unlocked by 17 tracked gamers (35% - TA Ratio = 1.68)  
Askar28 (10)
This is a rare achievementHalo 3: Beat the par score on The Storm.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
Assault15 (10)
Halo 3: Complete The Storm.
Unlocked by 22 tracked gamers (46% - TA Ratio = 1.47)  
Halo CE: Complete Assault on the Control Room.
Unlocked by 20 tracked gamers (42% - TA Ratio = 1.54)  
This is a rare achievementHalo 3: Find the hidden Skull on the Assembly multiplayer map.
Unlocked by 9 tracked gamers (19% - TA Ratio = 2.30)  
This is a rare achievementHalo 3: Activate Terminal 6 on The Covenant.
Unlocked by 10 tracked gamers (21% - TA Ratio = 2.19)  
This is a rare achievementHalo 2: Play a game of Halo 2 Anniversary on the 9th of any month.
Unlocked by 18 tracked gamers (38% - TA Ratio = 1.63)  
This is a rare achievementHalo 2: Complete the LASO campaign playlist.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo CE: Play a CTF custom game on Blood Gulch with 4 players on the same console. Tri-tip optional.
Unlocked by 8 tracked gamers (17% - TA Ratio = 2.44)  
Kill 100 Grunts.
Unlocked by 36 tracked gamers (75% - TA Ratio = 1.15)  
This is a rare achievementWin 250 multiplayer games.
Unlocked by 4 tracked gamers (8% - TA Ratio = 3.46)  
Beachhead35 (10)
This is a rare achievementHalo CE: Storm The Silent Cartographer beach with no Marine casualties on Heroic or Legendary.
Unlocked by 4 tracked gamers (8% - TA Ratio = 3.46)  
This is a rare achievementHalo CE: Activate Terminal 6 on 343 Guilty Spark.
Unlocked by 8 tracked gamers (17% - TA Ratio = 2.44)  
This is a rare achievementHalo CE: Complete every level of the game having seen it in both classic and remastered mode.
Unlocked by 8 tracked gamers (17% - TA Ratio = 2.44)  
This is a rare achievementHalo 3: Activate Terminal 3 on The Ark.
Unlocked by 15 tracked gamers (31% - TA Ratio = 1.78)  
This is a rare achievementHalo 3: On Tsavo Highway, complete the level without entering a vehicle.
Unlocked by 7 tracked gamers (15% - TA Ratio = 2.61)  
This is a rare achievementHalo CE: Complete every level of the game on Heroic difficulty.
Unlocked by 5 tracked gamers (10% - TA Ratio = 3.09)  
This is a rare achievementHalo 2: Stick a Plasma Grenade to a Stealth Elite on Outskirts.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo 3: Beat the par score on every Halo 3 level.
Unlocked by 5 tracked gamers (10% - TA Ratio = 3.09)  
This is a rare achievementHalo 2: Complete every level of the game on Easy difficulty.
Unlocked by 11 tracked gamers (23% - TA Ratio = 2.08)  
This is a rare achievementComplete 400 missions or multiplayer games.
Unlocked by 5 tracked gamers (10% - TA Ratio = 3.09)  
This is a rare achievementHalo CE: Complete every level of the game on Normal difficulty.
Unlocked by 9 tracked gamers (19% - TA Ratio = 2.30)  
This is a rare achievementKill a 343 developer in matchmaking or someone who has this achievement.
Unlocked by 14 tracked gamers (29% - TA Ratio = 1.85)  
This is a rare achievementHalo 2A MP: Destroyed all the Halo 2 Anniversary Multiplayer BLAST soda cans.
Unlocked by 9 tracked gamers (19% - TA Ratio = 2.30)  
This is a rare achievementHalo 2A MP: Found and destroyed the BLAST soda can on Bloodline.
Unlocked by 10 tracked gamers (21% - TA Ratio = 2.19)  
This is a rare achievementHalo 2A MP: Blow up the Banshee or Hornet in flight while piloted, with the Rocket Launcher.
Unlocked by 9 tracked gamers (19% - TA Ratio = 2.30)  
Bomb Squad40 (10)
This is a rare achievementHalo 2: Beat the par score on Cairo Station.
Unlocked by 3 tracked gamers (6% - TA Ratio = 4.00)  
This is a rare achievementHalo 2A MP: In Assault, take, plant, and score from the bomb spawn without dying or dropping it.
Unlocked by 11 tracked gamers (23% - TA Ratio = 2.08)  
This is a rare achievementComplete 200 missions or multiplayer games.
Unlocked by 12 tracked gamers (25% - TA Ratio = 2.00)  
This is a rare achievementHalo 3: Complete a Halo 3 playlist.
Unlocked by 11 tracked gamers (23% - TA Ratio = 2.08)  
Boundless26 (10)
This is a rare achievementHalo 2: Beat the par score on Delta Halo.
Unlocked by 7 tracked gamers (15% - TA Ratio = 2.61)  
Brainpan23 (10)
This is a rare achievementHalo 3: Find all the hidden multiplayer Skulls.
Unlocked by 9 tracked gamers (19% - TA Ratio = 2.30)  
Bro Hammer16 (10)
This is a rare achievementComplete any co-op level on Legendary difficulty.
Unlocked by 19 tracked gamers (40% - TA Ratio = 1.58)  
This is a rare achievementHalo 4: Complete Infinity without one preventable Marine death on Heroic or Legendary.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementComplete any co-op level on Heroic difficulty.
Unlocked by 22 tracked gamers (46% - TA Ratio = 1.47)  
Halo 2: Complete Cairo Station.
Unlocked by 27 tracked gamers (56% - TA Ratio = 1.33)  
This is a rare achievementComplete 300 missions or multiplayer games.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
Halo 3: Fight alongside and listen to The Man. The Legend. Chips Dubbo.
Unlocked by 29 tracked gamers (60% - TA Ratio = 1.28)  
This is a rare achievementComplete 150 missions or multiplayer games.
Unlocked by 13 tracked gamers (27% - TA Ratio = 1.92)  
Catch This26 (10)
This is a rare achievementEarn a total of 500 Grenade Kill or Plasma Kill medals in matchmade games.
Unlocked by 7 tracked gamers (15% - TA Ratio = 2.61)  
Cavalier24 (10)
This is a rare achievementHalo 3: Beat the par score on Tsavo Highway.
Unlocked by 8 tracked gamers (17% - TA Ratio = 2.44)  
Charted40 (10)
This is a rare achievementHalo CE: Beat the par score on The Silent Cartographer.
Unlocked by 3 tracked gamers (6% - TA Ratio = 4.00)  
This is a rare achievementHalo 4: Activate Terminal 3 on Infinity.
Unlocked by 18 tracked gamers (38% - TA Ratio = 1.63)  
This is a rare achievementHalo CE: Complete a match on at least 4 unique game types.
Unlocked by 9 tracked gamers (19% - TA Ratio = 2.30)  
Checkmate12 (5)
This is a rare achievementKill 100 Watchers.
Unlocked by 10 tracked gamers (21% - TA Ratio = 2.30)  
This is a rare achievementHalo 4: Complete a Halo 4 playlist.
Unlocked by 12 tracked gamers (25% - TA Ratio = 2.00)  
This is a rare achievementCollect 7,000 campaign or playlist medals.
Unlocked by 15 tracked gamers (31% - TA Ratio = 1.78)  
This is a rare achievementHalo 2A MP: Kill an opponent by detonating a Fusion Coil.
Unlocked by 10 tracked gamers (21% - TA Ratio = 2.19)  
Committed28 (10)
This is a rare achievementComplete 350 missions or multiplayer games.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
Commuter28 (10)
This is a rare achievementHalo 2: Complete Metropolis without entering a vehicle on Heroic or Legendary.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
Composer15 (10)
Halo 4: Complete Composer.
Unlocked by 22 tracked gamers (46% - TA Ratio = 1.51)  
This is a rare achievementHalo 2: Complete three Halo 2 playlists.
Unlocked by 4 tracked gamers (8% - TA Ratio = 3.46)  
This is a rare achievementHalo CE: Beat the par score on The Maw.
Unlocked by 3 tracked gamers (6% - TA Ratio = 4.00)  
Contender19 (10)
This is a rare achievementWin 50 multiplayer games.
Unlocked by 14 tracked gamers (29% - TA Ratio = 1.85)  
This is a rare achievementHalo 3: Listen to the story of the Final Grunt.
Unlocked by 8 tracked gamers (17% - TA Ratio = 2.44)  
Countdown28 (10)
This is a rare achievementHalo 4: Beat the par time on Midnight.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo 2A MP: With a Sniper Rifle or Beam Rifle kill an enemy that was zoomed in.
Unlocked by 11 tracked gamers (23% - TA Ratio = 2.08)  
This is a rare achievementHalo 2: Listen to the Cowardly Grunt's woes.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
Cryptum12 (5)
This is a rare achievementHalo 4: Activate Terminal 7 on Midnight.
Unlocked by 9 tracked gamers (19% - TA Ratio = 2.30)  
Curious12 (5)
This is a rare achievementHalo 2: Activate Terminal 1 on Cairo Station.
Unlocked by 9 tracked gamers (19% - TA Ratio = 2.30)  
Dambuster18 (10)
This is a rare achievementHalo 3: Beat the par time on Floodgate.
Unlocked by 15 tracked gamers (31% - TA Ratio = 1.78)  
This is a rare achievementKill 1000 Brutes.
Unlocked by 9 tracked gamers (19% - TA Ratio = 2.30)  
This is a rare achievementHalo 4: Beat the par score on Requiem.
Unlocked by 8 tracked gamers (17% - TA Ratio = 2.44)  
Dawn14 (10)
Halo 4: Complete Dawn.
Unlocked by 26 tracked gamers (54% - TA Ratio = 1.35)  
This is a rare achievementHalo CE: Activate all Halo: CE Terminals.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo 2A MP: Get awarded at least 10 different medals in one multiplayer game.
Unlocked by 13 tracked gamers (27% - TA Ratio = 1.92)  
Kill 100 Flood.
Unlocked by 29 tracked gamers (60% - TA Ratio = 1.28)  
Delighted10 (5)
This is a rare achievementHalo 2: Activate Terminal 9 on Quarantine Zone.
Unlocked by 12 tracked gamers (25% - TA Ratio = 2.00)  
Delta Halo16 (10)
Halo 2: Complete Delta Halo.
Unlocked by 18 tracked gamers (38% - TA Ratio = 1.63)  
Demon21 (10)
This is a rare achievementHalo 2: Complete any campaign level without dying on Normal or harder.
Unlocked by 11 tracked gamers (23% - TA Ratio = 2.08)  
This is a rare achievementHalo 2: View one of the seasonal signs on Zanzibar in classic multiplayer.
Unlocked by 10 tracked gamers (21% - TA Ratio = 2.19)  
This is a rare achievementHalo 2: Activate Terminal 8 on Sacred Icon.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo 3: Complete all Halo 3 Legendary campaign missions in under 3 hours.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
Devotee57 (20)
This is a rare achievementHalo 4: Complete three Halo 4 playlists.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo CE: Beat par time on all Halo: CE levels.
Unlocked by 3 tracked gamers (6% - TA Ratio = 4.00)  
This is a rare achievementHalo 4: Kill 3 Crawlers in one hit with the Gravity Hammer on Midnight.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo 2: Collect the Tartarus toy in Quarantine Zone.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo CE: Beat the par score on 343 Guilty Spark.
Unlocked by 3 tracked gamers (6% - TA Ratio = 4.00)  
This is a rare achievementHalo 3: Find the hidden Skull on the Citadel multiplayer map.
Unlocked by 9 tracked gamers (19% - TA Ratio = 2.30)  
Cleansing14 (10)
Halo 3: Complete Floodgate.
Unlocked by 23 tracked gamers (48% - TA Ratio = 1.44)  
Halo CE: Complete The Truth and Reconciliation with at least four rounds left in your Sniper Rifle.
Unlocked by 16 tracked gamers (33% - TA Ratio = 1.73)  
This is a rare achievementHalo 2A MP: On Lockdown, kill an opponent with the hanging ice.
Unlocked by 10 tracked gamers (21% - TA Ratio = 2.19)  
Waypoint28 (10)
This is a rare achievementHalo 3: Beat the par time on The Ark.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementKill 1000 Elites.
Unlocked by 18 tracked gamers (38% - TA Ratio = 1.63)  
Wetwork11 (5)
This is a rare achievementHalo 2A MP: On Shrine in CTF, activate the enemy base waterfall and, before it stops, grab the flag.
Unlocked by 10 tracked gamers (21% - TA Ratio = 2.19)  
Complete 10 missions or multiplayer games.
Unlocked by 35 tracked gamers (73% - TA Ratio = 1.17)  
This is a rare achievementHalo CE: Beat the par time on The Pillar of Autumn.
Unlocked by 13 tracked gamers (27% - TA Ratio = 1.92)  
This is a rare achievementHalo 4: Access the Master Chief's records on Dawn.
Unlocked by 17 tracked gamers (35% - TA Ratio = 1.73)  
Dim Mak24 (10)
This is a rare achievementEarn a total of 250 Beat Down medals in multiplayer.
Unlocked by 8 tracked gamers (17% - TA Ratio = 2.44)  
This is a rare achievementHalo 3: Trigger the hidden music cue in Halo 3.
Unlocked by 7 tracked gamers (15% - TA Ratio = 2.61)  
Halo 2: Fly the Heretic Banshee.
Unlocked by 22 tracked gamers (46% - TA Ratio = 1.47)  
Dogcatcher24 (10)
This is a rare achievementKill 1000 Crawlers.
Unlocked by 8 tracked gamers (17% - TA Ratio = 2.44)  
Domination26 (10)
This is a rare achievementEarn a total of 100 Legendary medals in matchmade games.
Unlocked by 7 tracked gamers (15% - TA Ratio = 2.61)  
This is a rare achievementHalo 2: Beat the par time on Cairo Station.
Unlocked by 10 tracked gamers (21% - TA Ratio = 2.19)  
This is a rare achievementHalo 2: Collect the Cortana toy in Gravemind.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo 2A MP: In Anniversary multiplayer, receive 2 or more Double Kill medals.
Unlocked by 10 tracked gamers (21% - TA Ratio = 2.19)  
This is a rare achievementEarn a total of 250 Double Kill medals in matchmade games.
Unlocked by 7 tracked gamers (15% - TA Ratio = 2.61)  
E E E15 (5)
This is a rare achievementHalo 2: View both signs in the level Metropolis.
Unlocked by 5 tracked gamers (10% - TA Ratio = 3.09)  
This is a rare achievementHalo 3: View the communique from Mendicant Bias.
Unlocked by 8 tracked gamers (17% - TA Ratio = 2.44)  
This is a rare achievementHalo 4: Beat the par time on all Halo 4 levels.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo CE: Beat the par time on Two Betrayals.
Unlocked by 3 tracked gamers (6% - TA Ratio = 4.00)  
Halo 3: On The Ark, complete the level without entering a vehicle on Legendary.
No tracked gamers have this achievement  
This is a rare achievementHalo 3: View 2 different sigils on Valhalla.
Unlocked by 11 tracked gamers (23% - TA Ratio = 2.08)  
This is a rare achievementHalo 2: View this hidden message on the classic Beaver Creek map.
Unlocked by 10 tracked gamers (21% - TA Ratio = 2.19)  
This is a rare achievementHalo 2: View the smiling face in the classic multiplayer map Coagulation.
Unlocked by 9 tracked gamers (19% - TA Ratio = 2.30)  
This is a rare achievementHalo 2: Complete a match on at least 4 different game types in classic multiplayer.
Unlocked by 13 tracked gamers (27% - TA Ratio = 1.92)  
This is a rare achievementHalo 4: Beat the par score on Shutdown.
Unlocked by 8 tracked gamers (17% - TA Ratio = 2.44)  
This is a rare achievementHalo 3: Find and claim all Skulls in Halo 3.
Unlocked by 8 tracked gamers (17% - TA Ratio = 2.44)  
This is a rare achievementHalo 2A MP: In Territories, control any 3 Territories simultaneously for 30 seconds.
Unlocked by 10 tracked gamers (21% - TA Ratio = 2.19)  
This is a rare achievementHalo 4: Beat the par score on Midnight.
Unlocked by 8 tracked gamers (17% - TA Ratio = 2.44)  
This is a rare achievementHalo 3: Complete every level of the game on Heroic difficulty.
Unlocked by 10 tracked gamers (21% - TA Ratio = 2.19)  
This is a rare achievementHalo 3: Complete a match on at least 8 different multiplayer maps.
Unlocked by 13 tracked gamers (27% - TA Ratio = 1.92)  
Enamored11 (5)
This is a rare achievementHalo 2: Activate Terminal 7 on Regret.
Unlocked by 10 tracked gamers (21% - TA Ratio = 2.19)  
This is a rare achievementHalo 2: Activate Terminal 6 on Delta Halo.
Unlocked by 16 tracked gamers (33% - TA Ratio = 1.73)  
This is a rare achievementHalo 2A MP: Found and destroyed the BLAST soda can on Shrine.
Unlocked by 10 tracked gamers (21% - TA Ratio = 2.19)  
Examiner10 (5)
This is a rare achievementHalo 2: Activate Terminal 3 on Metropolis.
Unlocked by 13 tracked gamers (27% - TA Ratio = 1.92)  
This is a rare achievementHalo CE: Beat the par time on Assault on the Control Room.
Unlocked by 3 tracked gamers (6% - TA Ratio = 4.00)  
This is a rare achievementHalo CE: Complete three Halo: CE playlists.
Unlocked by 3 tracked gamers (6% - TA Ratio = 4.00)  
This is a rare achievementHalo CE: Destroy four Wraith tanks in Assault on the Control Room with the Scorpion tank.
Unlocked by 4 tracked gamers (8% - TA Ratio = 3.46)  
Wyrmslayer35 (10)
This is a rare achievementKill 250 Hunters.
Unlocked by 4 tracked gamers (8% - TA Ratio = 3.46)  
This is a rare achievementHalo 2: Beat the par time on The Arbiter.
Unlocked by 5 tracked gamers (10% - TA Ratio = 3.09)  
This is a rare achievementHalo CE: Kill a Hunter with one pistol round.
Unlocked by 10 tracked gamers (21% - TA Ratio = 2.19)  
This is a rare achievementHalo CE: Beat the par time on The Truth and Reconciliation.
Unlocked by 4 tracked gamers (8% - TA Ratio = 3.46)  
This is a rare achievementHalo 4: Trick or force a Hunter to fall to its demise on Shutdown on Heroic or Legendary.
Unlocked by 10 tracked gamers (21% - TA Ratio = 2.19)  
This is a rare achievementHalo 4: Beat the par score on every Halo 4 level.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo 3: Beat the par score on Floodgate.
Unlocked by 5 tracked gamers (10% - TA Ratio = 3.09)  
This is a rare achievementHalo 2: Activate Terminal 5 on The Oracle.
Unlocked by 15 tracked gamers (31% - TA Ratio = 1.78)  
This is a rare achievementHalo 2: Beat the par time on High Charity.
Unlocked by 8 tracked gamers (17% - TA Ratio = 2.44)  
This is a rare achievementHalo CE: Complete a level without jumping.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo 3: Complete every level of the game on Legendary difficulty.
Unlocked by 9 tracked gamers (19% - TA Ratio = 2.30)  
This is a rare achievementHalo CE: Beat the par score on The Truth and Reconciliation.
Unlocked by 4 tracked gamers (8% - TA Ratio = 3.46)  
This is a rare achievementHalo 2: Beat the par score on Regret.
Unlocked by 4 tracked gamers (8% - TA Ratio = 3.46)  
This is a rare achievementHalo 2A MP: Kill an opponent that has the Ninja Redux achievement in Anniversary matchmaking.
Unlocked by 11 tracked gamers (23% - TA Ratio = 2.08)  
Flipyap15 (5)
This is a rare achievementHalo 3: Listen to the tale of a young Grunt named Flipyap.
Unlocked by 5 tracked gamers (10% - TA Ratio = 3.09)  
Complete a campaign mission or a match of multiplayer.
Unlocked by 47 tracked gamers (98% - TA Ratio = 1.01)  
Flood8 (5)
This is a rare achievementHalo 4: Activate Terminal 4 on Reclaimer.
Unlocked by 19 tracked gamers (40% - TA Ratio = 1.58)  
This is a rare achievementHalo 4: Complete all Halo 4 Legendary campaign missions in under 3 hours.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo 4: What do Marines know about sticks?
Unlocked by 7 tracked gamers (15% - TA Ratio = 2.61)  
Zealot28 (10)
This is a rare achievementHalo 2A MP: In Anniversary matchmaking, win 10 games as an Elite.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo CE: Beat the par time on Halo.
Unlocked by 4 tracked gamers (8% - TA Ratio = 3.46)  
Foe Hammer14 (10)
Kill 5,000 enemies or players.
Unlocked by 23 tracked gamers (48% - TA Ratio = 1.44)  
This is a rare achievementHalo 2: Beat the par time on Gravemind.
Unlocked by 3 tracked gamers (6% - TA Ratio = 4.00)  
Forerunner15 (10)
Halo 4: Complete Forerunner.
Unlocked by 23 tracked gamers (48% - TA Ratio = 1.47)  
This is a rare achievementWin 100 multiplayer games.
Unlocked by 9 tracked gamers (19% - TA Ratio = 2.30)  
This is a rare achievementHalo 2: Beat the par score on The Great Journey.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
Kill 1000 Flood.
Unlocked by 24 tracked gamers (50% - TA Ratio = 1.41)  
This is a rare achievementCreated and saved 5 Custom Game types.
Unlocked by 8 tracked gamers (17% - TA Ratio = 2.44)  
Game On13 (10)
This is a rare achievementComplete 50 missions or multiplayer games.
Unlocked by 27 tracked gamers (56% - TA Ratio = 1.33)  
This is a rare achievementHalo 2A MP: Found and destroyed the BLAST soda can on Stonetown.
Unlocked by 10 tracked gamers (21% - TA Ratio = 2.19)  
This is a rare achievementHalo CE: Ride in a Pelican for several seconds on the level 343 Guilty Spark.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo CE: Beat the par score on Halo.
Unlocked by 3 tracked gamers (6% - TA Ratio = 4.00)  
Gimme That26 (10)
This is a rare achievementHalo 4: Beat the par time on Reclaimer.
Unlocked by 7 tracked gamers (15% - TA Ratio = 2.61)  
This is a rare achievementHalo 4: Take out both Hunters using only the Sticky Detonator on Composer.
Unlocked by 12 tracked gamers (25% - TA Ratio = 2.00)  
This is a rare achievementHalo 2: Kill an enraged, berserk Brute using melee.
Unlocked by 24 tracked gamers (50% - TA Ratio = 1.44)  
This is a rare achievementHalo 3: Beat the par time on Halo.
Unlocked by 8 tracked gamers (17% - TA Ratio = 2.44)  
Goat Roped120 (30)
This is a rare achievementHalo CE: Halo CE: Complete all Halo: CE Legendary campaign missions in under 3 hours.
Unlocked by 3 tracked gamers (6% - TA Ratio = 4.00)  
Kill 100 Brutes.
Unlocked by 26 tracked gamers (54% - TA Ratio = 1.35)  
This is a rare achievementHalo 4: Complete a match on at least 8 different multiplayer maps.
Unlocked by 14 tracked gamers (29% - TA Ratio = 1.85)  
This is a rare achievementHalo 2: Beat par time on all Halo 2 levels.
Unlocked by 3 tracked gamers (6% - TA Ratio = 4.00)  
This is a rare achievementHalo 2: Shoot the soccer ball in the level Metropolis.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo 2A MP: In one match, steal a total of 5 occupied vehicles from opponents.
Unlocked by 12 tracked gamers (25% - TA Ratio = 2.00)  
Gravemind17 (10)
This is a rare achievementHalo 2: Complete Gravemind.
Unlocked by 16 tracked gamers (33% - TA Ratio = 1.73)  
Greenhorn18 (10)
This is a rare achievementHalo CE: Complete every level of the game on Easy difficulty.
Unlocked by 15 tracked gamers (31% - TA Ratio = 1.78)  
Kill 1000 Grunts.
Unlocked by 24 tracked gamers (50% - TA Ratio = 1.44)  
This is a rare achievementHalo 2A MP: Get a kill with the Gungoose while airborne.
Unlocked by 7 tracked gamers (15% - TA Ratio = 2.61)  
This is a rare achievementHalo 3: Beat the par score on Halo.
Unlocked by 8 tracked gamers (17% - TA Ratio = 2.44)  
This is a rare achievementHalo 2A MP: Complete a game in every one of the 6 updated Anniversary MP maps.
Unlocked by 12 tracked gamers (25% - TA Ratio = 2.00)  
Tourist19 (10)
This is a rare achievementHalo 2: Complete a match on at least 8 different classic multiplayer maps.
Unlocked by 13 tracked gamers (27% - TA Ratio = 1.92)  
Toybox57 (20)
This is a rare achievementHalo 2: Collect all eight Halo toys.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo 3: Complete every level of the game on Easy difficulty.
Unlocked by 17 tracked gamers (35% - TA Ratio = 1.68)  
T-Rex28 (10)
This is a rare achievementHalo CE: Find the hidden Rex sign on The Maw.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo 2A MP: In Ricochet, pass once, score once, and kill at least one enemy in the same match.
Unlocked by 7 tracked gamers (15% - TA Ratio = 2.61)  
This is a rare achievementHalo 2: Find and claim all Skulls in Halo 2.
Unlocked by 5 tracked gamers (10% - TA Ratio = 3.09)  
Halo CE: Complete The Truth and Reconciliation.
Unlocked by 24 tracked gamers (50% - TA Ratio = 1.41)  
Halo CE: Complete Two Betrayals.
Unlocked by 19 tracked gamers (40% - TA Ratio = 1.58)  
This is a rare achievementHalo CE: Kill every Elite on the level Keyes on Heroic or Legendary difficulty.
Unlocked by 3 tracked gamers (6% - TA Ratio = 4.00)  
Unto Dust10 (5)
This is a rare achievementHalo 3: Activate Terminal 5 on The Covenant.
Unlocked by 11 tracked gamers (23% - TA Ratio = 2.08)  
This is a rare achievementComplete 250 missions or multiplayer games.
Unlocked by 8 tracked gamers (17% - TA Ratio = 2.44)  
Guerilla28 (10)
This is a rare achievementHalo 3: Beat the par score on Sierra 117.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
Uprising16 (10)
This is a rare achievementHalo 2: Complete Uprising.
Unlocked by 18 tracked gamers (38% - TA Ratio = 1.63)  
Vanguard26 (10)
This is a rare achievementHalo 3: Beat the par score on The Covenant.
Unlocked by 7 tracked gamers (15% - TA Ratio = 2.61)  
Veteran85 (30)
This is a rare achievementComplete all campaigns on Normal difficulty.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo 2: Beat the par score on Sacred Icon.
Unlocked by 3 tracked gamers (6% - TA Ratio = 4.00)  
Gunslinger22 (10)
This is a rare achievementHalo 4: Beat the par score on Dawn.
Unlocked by 10 tracked gamers (21% - TA Ratio = 2.19)  
This is a rare achievementHalo CE: Beat the par score on Assault on the Control Room.
Unlocked by 3 tracked gamers (6% - TA Ratio = 4.00)  
This is a rare achievementHalo 4: Complete every level of the game on Normal difficulty.
Unlocked by 14 tracked gamers (29% - TA Ratio = 1.85)  
Halo14 (10)
Halo CE: Complete Halo.
Unlocked by 25 tracked gamers (52% - TA Ratio = 1.38)  
This is a rare achievementHalo 3: Find a lonely missing link.
Unlocked by 7 tracked gamers (15% - TA Ratio = 2.61)  
This is a rare achievementHalo 2: Complete Delta Halo without entering a vehicle on Heroic or Legendary.
Unlocked by 4 tracked gamers (8% - TA Ratio = 3.46)  
This is a rare achievementHalo 4: Beat the par score on Composer.
Unlocked by 13 tracked gamers (27% - TA Ratio = 1.92)  
Headhunter57 (20)
This is a rare achievementHalo CE: Find and claim all Skulls in Halo: CE.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo 3: Destined for greatness.
Unlocked by 8 tracked gamers (17% - TA Ratio = 2.44)  
Headstrong40 (10)
This is a rare achievementHalo CE: Beat the par score on Keyes.
Unlocked by 3 tracked gamers (6% - TA Ratio = 4.00)  
This is a rare achievementComplete all campaigns on Easy difficulty.
Unlocked by 9 tracked gamers (19% - TA Ratio = 2.30)  
This is a rare achievementHalo 2: Beat the par score on The Arbiter.
Unlocked by 3 tracked gamers (6% - TA Ratio = 4.00)  
This is a rare achievementHalo 3: Find the hidden Skull on the Heretic multiplayer map.
Unlocked by 9 tracked gamers (19% - TA Ratio = 2.30)  
Hero20 (20)
Halo 2: Complete every level of the game on Heroic difficulty.
No tracked gamers have this achievement  
This is a rare achievementHalo 2: Spot the developer in the opening cutscene of Gravemind on Legendary in Classic Mode.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo CE: Complete any level on Heroic difficulty or higher without taking health damage.
Unlocked by 8 tracked gamers (17% - TA Ratio = 2.44)  
HI BEN15 (5)
This is a rare achievementHalo 2: Oh, hi!
Unlocked by 5 tracked gamers (10% - TA Ratio = 3.09)  
This is a rare achievementHalo 2A MP: Found and destroyed the BLAST soda can on Zenith.
Unlocked by 10 tracked gamers (21% - TA Ratio = 2.19)  
This is a rare achievementHalo 2: Complete High Charity.
Unlocked by 17 tracked gamers (35% - TA Ratio = 1.68)  
This is a rare achievementHalo 3: Beat the par time on Tsavo Highway.
Unlocked by 16 tracked gamers (33% - TA Ratio = 1.73)  
This is a rare achievementHalo 3: Who DARED to discard this brave animal?
Unlocked by 10 tracked gamers (21% - TA Ratio = 2.19)  
This is a rare achievementHalo CE: Beat the par time on The Silent Cartographer.
Unlocked by 4 tracked gamers (8% - TA Ratio = 3.46)  
This is a rare achievementHalo CE: Activate Terminal 5 on Assault on the Control Room.
Unlocked by 11 tracked gamers (23% - TA Ratio = 2.08)  
Holdout14 (10)
Halo 3: Complete Crow's Nest.
Unlocked by 23 tracked gamers (48% - TA Ratio = 1.44)  
Hot Zone31 (10)
This is a rare achievementHalo 2: Beat the par time on Quarantine Zone.
Unlocked by 5 tracked gamers (10% - TA Ratio = 3.09)  
This is a rare achievementHalo CE: Complete Halo without entering a vehicle.
Unlocked by 3 tracked gamers (6% - TA Ratio = 4.00)  
This is a rare achievementKill 50 Hunters.
Unlocked by 18 tracked gamers (38% - TA Ratio = 1.63)  
This is a rare achievementComplete one cross-game playlist.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
I Got This15 (10)
This is a rare achievementComplete 100 missions or multiplayer games.
Unlocked by 22 tracked gamers (46% - TA Ratio = 1.47)  
This is a rare achievementHalo CE: Complete The Pillar of Autumn on Legendary without picking up a health kit.
Unlocked by 7 tracked gamers (15% - TA Ratio = 2.61)  
This is a rare achievementHalo 2: Activate all Halo 2 Terminals.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
War8 (5)
This is a rare achievementHalo 4: Activate Terminal 1 on Requiem.
Unlocked by 17 tracked gamers (35% - TA Ratio = 1.68)  
This is a rare achievementHalo 2: Collect the Rampant Cortana toy in High Charity.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo 4: Complete every level of the game on Heroic difficulty.
Unlocked by 12 tracked gamers (25% - TA Ratio = 2.00)  
War Hero139 (40)
This is a rare achievementComplete all campaigns on Heroic difficulty.
Unlocked by 4 tracked gamers (8% - TA Ratio = 3.46)  
This is a rare achievementHalo 2: Beat the par time on Regret.
Unlocked by 3 tracked gamers (6% - TA Ratio = 4.00)  
This is a rare achievementKill 100 Knights.
Unlocked by 18 tracked gamers (38% - TA Ratio = 1.68)  
Halo CE: Activate Terminal 4 on The Silent Cartographer.
Unlocked by 17 tracked gamers (35% - TA Ratio = 1.68)  
This is a rare achievementWin 200 multiplayer games.
Unlocked by 5 tracked gamers (10% - TA Ratio = 3.09)  
Infinity15 (10)
Halo 4: Complete Infinity.
Unlocked by 21 tracked gamers (44% - TA Ratio = 1.51)  
This is a rare achievementHalo 2: Activate Terminal 2 on Outskirts.
Unlocked by 8 tracked gamers (17% - TA Ratio = 2.44)  
Inspector11 (5)
This is a rare achievementHalo 2: Activate Terminal 4 on The Arbiter.
Unlocked by 10 tracked gamers (21% - TA Ratio = 2.19)  
Interloper26 (10)
This is a rare achievementHalo 4: Beat the par time on Requiem.
Unlocked by 7 tracked gamers (15% - TA Ratio = 2.61)  
This is a rare achievementHalo 3: Activate Terminal 2 on The Ark.
Unlocked by 13 tracked gamers (27% - TA Ratio = 1.92)  
This is a rare achievementHalo 2A MP: In King of the Hill, kill 5 opponents within your controlled hill.
Unlocked by 9 tracked gamers (19% - TA Ratio = 2.30)  
This is a rare achievementHalo CE: Beat the par score on Two Betrayals.
Unlocked by 4 tracked gamers (8% - TA Ratio = 3.46)  
Warden22 (10)
This is a rare achievementHalo 2 MP: In Classic or Anniversary matchmaking, stop the killing spree of another player.
Unlocked by 10 tracked gamers (21% - TA Ratio = 2.19)  
This is a rare achievementHalo 4: Beat the par score on Infinity.
Unlocked by 16 tracked gamers (33% - TA Ratio = 1.73)  
Collect 500 campaign or playlist medals.
Unlocked by 28 tracked gamers (58% - TA Ratio = 1.30)  
This is a rare achievementHalo 3: Complete a match on at least 4 different game types in multiplayer.
Unlocked by 13 tracked gamers (27% - TA Ratio = 1.92)  
Kill 100 enemies or players.
Unlocked by 39 tracked gamers (81% - TA Ratio = 1.10)  
Justice10 (5)
This is a rare achievementHalo 4: Activate Terminal 6 on Composer.
Unlocked by 13 tracked gamers (27% - TA Ratio = 1.92)  
Keyes17 (10)
This is a rare achievementHalo CE: Complete Keyes.
Unlocked by 17 tracked gamers (35% - TA Ratio = 1.68)  
This is a rare achievementHalo CE: Activate Terminal 10 on The Maw.
Unlocked by 14 tracked gamers (29% - TA Ratio = 1.85)  
This is a rare achievementHalo 3: Beat the par score on Crow's Nest.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
Knightbane40 (10)
This is a rare achievementKill 1000 Knights.
Unlocked by 3 tracked gamers (6% - TA Ratio = 4.00)  
Knights9 (5)
This is a rare achievementHalo 4: Activate Terminal 5 on Shutdown.
Unlocked by 14 tracked gamers (29% - TA Ratio = 1.85)  
This is a rare achievementHalo 2: Activate Terminal 10 on Gravemind.
Unlocked by 10 tracked gamers (21% - TA Ratio = 2.19)  
Landfall14 (10)
Halo 3: Complete Sierra 117.
Unlocked by 25 tracked gamers (52% - TA Ratio = 1.38)  
LASO Master173 (50)
This is a rare achievementComplete each individual game specific LASO playlist for every Halo game.
Unlocked by 4 tracked gamers (8% - TA Ratio = 3.46)  
Warrior26 (10)
This is a rare achievementHalo 2: Complete every level of the game on Normal difficulty.
Unlocked by 7 tracked gamers (15% - TA Ratio = 2.61)  
This is a rare achievementHalo 2: Complete The Great Journey.
Unlocked by 18 tracked gamers (38% - TA Ratio = 1.63)  
Get killed by the Guardians.
Unlocked by 34 tracked gamers (71% - TA Ratio = 1.18)  
This is a rare achievementHalo 2: Beat the par score on Uprising.
Unlocked by 3 tracked gamers (6% - TA Ratio = 4.00)  
The Key16 (10)
This is a rare achievementHalo 3: Complete Cortana.
Unlocked by 19 tracked gamers (40% - TA Ratio = 1.58)  
This is a rare achievementHalo 4: Complete every level of the game on Legendary difficulty.
Unlocked by 11 tracked gamers (23% - TA Ratio = 2.08)  
Halo CE: Complete The Library.
Unlocked by 20 tracked gamers (42% - TA Ratio = 1.54)  
This is a rare achievementComplete 500 missions or multiplayer games.
Unlocked by 4 tracked gamers (8% - TA Ratio = 3.46)  
The Maw17 (10)
This is a rare achievementHalo CE: Complete The Maw.
Unlocked by 16 tracked gamers (33% - TA Ratio = 1.73)  
Kill 100 Elites.
Unlocked by 28 tracked gamers (58% - TA Ratio = 1.30)  
This is a rare achievementHalo 2: She's not picking up.
Unlocked by 4 tracked gamers (8% - TA Ratio = 3.46)  
The Road14 (10)
Halo 3: Complete Tsavo Highway.
Unlocked by 26 tracked gamers (54% - TA Ratio = 1.35)  
Halo CE: Complete The Silent Cartographer.
Unlocked by 21 tracked gamers (44% - TA Ratio = 1.51)  
Last Stand16 (10)
This is a rare achievementHalo 3: Complete The Covenant.
Unlocked by 19 tracked gamers (40% - TA Ratio = 1.58)  
This is a rare achievementHalo CE: Complete Two Betrayals on Legendary difficulty without picking up a new weapon.
Unlocked by 4 tracked gamers (8% - TA Ratio = 3.46)  
This is a rare achievementHalo 2: Beat the par score on The Oracle.
Unlocked by 4 tracked gamers (8% - TA Ratio = 3.46)  
This is a rare achievementEarn a total of 250 KOTH Mode Specific medals in matchmade games.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo 2: Collect the Arbiter toy in Sacred Icon.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementWin 300 multiplayer games.
Unlocked by 4 tracked gamers (8% - TA Ratio = 3.46)  
This is a rare achievementHalo 3: Play a game of Halo 3 on the 25th of any month.
Unlocked by 20 tracked gamers (42% - TA Ratio = 1.54)  
This is a rare achievementHalo 2A MP: Found and destroyed the BLAST soda can on Lockdown.
Unlocked by 10 tracked gamers (21% - TA Ratio = 2.19)  
This is a rare achievementHalo CE: Listen to the Thirsty Grunt talk about his eating habits.
Unlocked by 7 tracked gamers (15% - TA Ratio = 2.61)  
This is a rare achievementHalo 4: Carry a UNSC weapon all the way through Forerunner on Heroic or Legendary.
Unlocked by 8 tracked gamers (17% - TA Ratio = 2.44)  
This is a rare achievementHalo CE: Complete the Warthog ride of The Maw without being forcibly ejected from your vehicle.
Unlocked by 5 tracked gamers (10% - TA Ratio = 3.09)  
This is a rare achievementFind and claim all the campaign skulls in Halo:CE, Halo 2, and Halo 3.
Unlocked by 5 tracked gamers (10% - TA Ratio = 3.09)  
Legend50 (50)
Complete all campaigns on Legendary difficulty.
No tracked gamers have this achievement  
This is a rare achievementHalo 2: Complete every level of Halo 2 having seen it in both classic and remastered mode.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo 2A MP: Kill an opponent that has the Legendary Anniversary achievement.
Unlocked by 9 tracked gamers (19% - TA Ratio = 2.30)  
Time Shift26 (10)
This is a rare achievementHalo 3: Beat the par time on Crow's Nest.
Unlocked by 7 tracked gamers (15% - TA Ratio = 2.61)  
This is a rare achievementHalo 2: Complete every level of the game on Legendary difficulty.
Unlocked by 4 tracked gamers (8% - TA Ratio = 3.46)  
This is a rare achievementHalo 3: Activate Terminal 4 on The Covenant.
Unlocked by 12 tracked gamers (25% - TA Ratio = 2.00)  
TLDR31 (10)
This is a rare achievementHalo CE: Beat the par time on The Library.
Unlocked by 5 tracked gamers (10% - TA Ratio = 3.09)  
This is a rare achievementHalo 2: Beat the par time on Metropolis.
Unlocked by 8 tracked gamers (17% - TA Ratio = 2.44)  
This is a rare achievementHalo 3: Beat the par time on Sierra 117.
Unlocked by 7 tracked gamers (15% - TA Ratio = 2.61)  
Halo CE: Activate Terminal 3 on The Truth and Reconciliation.
Unlocked by 23 tracked gamers (48% - TA Ratio = 1.44)  
This is a rare achievementHalo 4: Complete every level of the game on Easy difficulty.
Unlocked by 18 tracked gamers (38% - TA Ratio = 1.63)  
Kill 100 Jackals.
Unlocked by 29 tracked gamers (60% - TA Ratio = 1.28)  
This is a rare achievementEarn a total of 100 Killing Spree medals in matchmade games.
Unlocked by 7 tracked gamers (15% - TA Ratio = 2.61)  
Complete any co-op level on Normal difficulty.
Unlocked by 26 tracked gamers (54% - TA Ratio = 1.35)  
This is a rare achievementHalo 2: Complete a level with only the Streaking Skull active on Heroic or Legendary.
Unlocked by 3 tracked gamers (6% - TA Ratio = 4.00)  
This is a rare achievementHalo 2A MP: In Juggernaut, survive as the Juggernaut for 30 seconds.
Unlocked by 11 tracked gamers (23% - TA Ratio = 2.08)  
Steady Aim35 (10)
This is a rare achievementWin 400 multiplayer games.
Unlocked by 4 tracked gamers (8% - TA Ratio = 3.46)  
Play a multiplayer or co-op game at least 3 months after your first game.
Unlocked by 23 tracked gamers (48% - TA Ratio = 1.44)  
This is a rare achievementWin 350 multiplayer games.
Unlocked by 4 tracked gamers (8% - TA Ratio = 3.46)  
This is a rare achievementHalo 3: Activate Terminal 7 on Halo.
Unlocked by 14 tracked gamers (29% - TA Ratio = 1.85)  
This is a rare achievementHalo 4: Beat the par time on Composer.
Unlocked by 7 tracked gamers (15% - TA Ratio = 2.61)  
Taste Test19 (10)
This is a rare achievementHalo 4: Complete a match on at least 4 different game types in multiplayer.
Unlocked by 14 tracked gamers (29% - TA Ratio = 1.85)  
This is a rare achievementHalo 4: Beat the par score on Reclaimer.
Unlocked by 8 tracked gamers (17% - TA Ratio = 2.44)  
This is a rare achievementWin 10 multiplayer games.
Unlocked by 23 tracked gamers (48% - TA Ratio = 1.44)  
This is a rare achievementHalo 2: Beat the par time on Sacred Icon.
Unlocked by 4 tracked gamers (8% - TA Ratio = 3.46)  
Life Story93 (30)
This is a rare achievementComplete the Master Chief Saga playlist.
Unlocked by 5 tracked gamers (10% - TA Ratio = 3.09)  
Terminus46 (20)
This is a rare achievementHalo 4: Activate all Halo 4 Terminals.
Unlocked by 9 tracked gamers (19% - TA Ratio = 2.30)  
This is a rare achievementHalo CE: Beat the par time on 343 Guilty Spark.
Unlocked by 4 tracked gamers (8% - TA Ratio = 3.46)  
This is a rare achievementHalo 3: Beat the par time on The Storm.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementKill 20,000 enemies or players.
Unlocked by 7 tracked gamers (15% - TA Ratio = 2.61)  
This is a rare achievementHalo CE: Complete the Halo: CE LASO Campaign playlist.
Unlocked by 4 tracked gamers (8% - TA Ratio = 3.46)  
This is a rare achievementHalo CE: Complete The Library on Heroic or Legendary difficulty without dying.
Unlocked by 3 tracked gamers (6% - TA Ratio = 4.00)  
This is a rare achievementHalo 2: Complete a level in co-op on Heroic or Legendary with the Masterblaster Skull active.
Unlocked by 4 tracked gamers (8% - TA Ratio = 3.46)  
This is a rare achievementHalo CE: Complete every level of the game on Legendary difficulty.
Unlocked by 4 tracked gamers (8% - TA Ratio = 3.46)  
Halo 2: Complete The Arbiter.
Unlocked by 22 tracked gamers (46% - TA Ratio = 1.47)  
This is a rare achievementHalo 4: Complete every level of the game on Legendary difficulty, by yourself.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
Halo 2: Fight alongside the legendary Chips Dubbo and listen to his words.
Unlocked by 25 tracked gamers (52% - TA Ratio = 1.38)  
This is a rare achievementHalo 3: Activate Cortana's Terminal on Cortana.
Unlocked by 8 tracked gamers (17% - TA Ratio = 2.44)  
This is a rare achievementComplete 450 missions or multiplayer games.
Unlocked by 4 tracked gamers (8% - TA Ratio = 3.46)  
This is a rare achievementHalo 2: Beat the par score on Quarantine Zone.
Unlocked by 4 tracked gamers (8% - TA Ratio = 3.46)  
This is a rare achievementCollect 9,000 campaign or playlist medals.
Unlocked by 11 tracked gamers (23% - TA Ratio = 2.08)  
This is a rare achievementHalo 3: Find the hidden Skull on the Longshore multilayer map.
Unlocked by 9 tracked gamers (19% - TA Ratio = 2.30)  
This is a rare achievementHalo CE: Complete Two Betrayals on Legendary difficulty without killing any Grunts.
Unlocked by 4 tracked gamers (8% - TA Ratio = 3.46)  
Halo 4: Activate Terminal 2 on Forerunner.
Unlocked by 17 tracked gamers (35% - TA Ratio = 1.73)  
This is a rare achievementActivate all terminals.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo 2A MP: Get 25 kills with the Gungoose in multiplayer.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo CE: Trigger a hidden music cue in Halo: CE.
Unlocked by 4 tracked gamers (8% - TA Ratio = 3.46)  
This is a rare achievementHalo 2: Find and claim the Famine Skull on Legendary.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo 2: Find and claim the Ghost Skull on Legendary.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo 2: Find and claim the Grunt Birthday Party Skull on Legendary.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo 3: Beat the par time on Cortana.
Unlocked by 7 tracked gamers (15% - TA Ratio = 2.61)  
This is a rare achievementHalo 2: Find and claim the Iron Skull on Legendary.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo 3: He's watching you.
Unlocked by 10 tracked gamers (21% - TA Ratio = 2.19)  
This is a rare achievementCreated and saved 5 Custom Maps in Forge.
Unlocked by 10 tracked gamers (21% - TA Ratio = 2.19)  
This is a rare achievementHalo 2: Find and claim the IWHBYD Skull on Legendary.
Unlocked by 5 tracked gamers (10% - TA Ratio = 3.09)  
This is a rare achievementCollect 10,000 campaign or playlist medals.
Unlocked by 9 tracked gamers (19% - TA Ratio = 2.30)  
This is a rare achievementHalo 2: Find and claim the Mythic Skull on Legendary.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo 2: Find and claim the Sputnik Skull on Legendary.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo 2: Find and claim the That's Just...Wrong Skull on Legendary.
Unlocked by 7 tracked gamers (15% - TA Ratio = 2.61)  
This is a rare achievementHalo 2: Find and claim the Thunderstorm Skull on Legendary.
Unlocked by 7 tracked gamers (15% - TA Ratio = 2.61)  
This is a rare achievementHalo 3: Find and claim the Black Eye Skull on Normal or harder.
Unlocked by 10 tracked gamers (21% - TA Ratio = 2.19)  
This is a rare achievementCollect 8,000 campaign or playlist medals.
Unlocked by 12 tracked gamers (25% - TA Ratio = 2.00)  
This is a rare achievementHalo 3: Find and claim the Blind Skull on Normal or harder.
Unlocked by 11 tracked gamers (23% - TA Ratio = 2.08)  
This is a rare achievementHalo 3: Find and claim the Catch Skull on Normal or harder.
Unlocked by 8 tracked gamers (17% - TA Ratio = 2.44)  
This is a rare achievementHalo 3: Find and claim the Cowbell Skull on Normal or harder.
Unlocked by 9 tracked gamers (19% - TA Ratio = 2.30)  
This is a rare achievementHalo 3: Find and claim the Famine Skull on Normal or harder.
Unlocked by 8 tracked gamers (17% - TA Ratio = 2.44)  
This is a rare achievementHalo 3: Find and claim the Fog Skull on Normal or harder.
Unlocked by 10 tracked gamers (21% - TA Ratio = 2.19)  
This is a rare achievementHalo 3: Find and claim the Grunt Birthday Party Skull on Normal or harder.
Unlocked by 10 tracked gamers (21% - TA Ratio = 2.19)  
This is a rare achievementHalo 3: Find and claim the Iron Skull on Normal or harder.
Unlocked by 11 tracked gamers (23% - TA Ratio = 2.08)  
This is a rare achievementHalo 3: Find and claim the IWHBYD Skull on Normal or harder.
Unlocked by 8 tracked gamers (17% - TA Ratio = 2.44)  
This is a rare achievementHalo 3: Find and claim the Mythic Skull on Normal or harder.
Unlocked by 12 tracked gamers (25% - TA Ratio = 2.00)  
This is a rare achievementHalo 3: Find and claim the Thunderstorm Skull on Normal or harder.
Unlocked by 9 tracked gamers (19% - TA Ratio = 2.30)  
This is a rare achievementHalo 3: Find and claim the Tilt Skull on Normal or harder.
Unlocked by 8 tracked gamers (17% - TA Ratio = 2.44)  
This is a rare achievementHalo 3: Find and claim the Tough Luck Skull on Normal or harder.
Unlocked by 10 tracked gamers (21% - TA Ratio = 2.19)  
This is a rare achievementHalo CE: Find and claim the Bandanna skull in remastered mode.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo CE: Find and claim the Black Eye skull in remastered mode.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo CE: Find and claim the Boom skull in remastered mode.
Unlocked by 10 tracked gamers (21% - TA Ratio = 2.19)  
This is a rare achievementHalo CE: Find and claim the Eye Patch skull in remastered mode.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo CE: Find and claim the Famine skull in remastered mode.
Unlocked by 12 tracked gamers (25% - TA Ratio = 2.00)  
This is a rare achievementHalo CE: Find and claim the Fog skull in remastered mode.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo CE: Find and claim the Foreign skull in remastered mode.
Unlocked by 11 tracked gamers (23% - TA Ratio = 2.08)  
This is a rare achievementHalo CE: Find and claim the Grunt Birthday Party skull in remastered mode.
Unlocked by 8 tracked gamers (17% - TA Ratio = 2.44)  
This is a rare achievementHalo CE: Find and claim the Iron skull in remastered mode.
Unlocked by 15 tracked gamers (31% - TA Ratio = 1.78)  
This is a rare achievementHalo CE: Find and claim the Malfunction skull in remastered mode.
Unlocked by 7 tracked gamers (15% - TA Ratio = 2.61)  
Halo CE: Find and claim the Mythic skull in remastered mode.
Unlocked by 16 tracked gamers (33% - TA Ratio = 1.73)  
This is a rare achievementHalo CE: Find and claim the Pinata skull in remastered mode.
Unlocked by 7 tracked gamers (15% - TA Ratio = 2.61)  
This is a rare achievementHalo CE: Find and claim the Recession skull in remastered mode.
Unlocked by 11 tracked gamers (23% - TA Ratio = 2.08)  
This is a rare achievementHalo 2: Beat the par time on Delta Halo.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo 2: Spot the Sid graffiti on the walls of Coagulation in classic multiplayer.
Unlocked by 10 tracked gamers (21% - TA Ratio = 2.19)  
This is a rare achievementHalo 2: Listen to a hidden music cue in Halo 2.
Unlocked by 10 tracked gamers (21% - TA Ratio = 2.19)  
This is a rare achievementHalo CE: Complete a match on at least 8 different classic multiplayer maps.
Unlocked by 9 tracked gamers (19% - TA Ratio = 2.30)  
This is a rare achievementHalo 2: Kill 7 opponents from behind in a row without being spotted.
Unlocked by 10 tracked gamers (21% - TA Ratio = 2.19)  
This is a rare achievementHalo 2: Drive a Scorpion while playing as the Arbiter.
Unlocked by 19 tracked gamers (40% - TA Ratio = 1.58)  
This is a rare achievementHalo 2A MP: Killed 15 opponents that were airborne from a Man Cannon.
Unlocked by 8 tracked gamers (17% - TA Ratio = 2.44)  
This is a rare achievementHalo 2: Find and claim the Anger Skull on Legendary.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo 2: Find and claim the Assassins Skull on Legendary.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo 2: Find and claim the Black Eye Skull on Legendary.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo 2: Find and claim the Blind Skull.
Unlocked by 7 tracked gamers (15% - TA Ratio = 2.61)  
This is a rare achievementHalo 2: Find and claim the Catch Skull on Legendary.
Unlocked by 7 tracked gamers (15% - TA Ratio = 2.61)  
This is a rare achievementHalo 2: Find and claim the Envy Skull on Legendary.
Unlocked by 7 tracked gamers (15% - TA Ratio = 2.61)  
This is a rare achievementHalo 3: Destroy 3 total Phantoms on The Covenant.
Unlocked by 10 tracked gamers (21% - TA Ratio = 2.19)  
This is a rare achievementHalo 4: Beat the par time on Dawn.
Unlocked by 9 tracked gamers (19% - TA Ratio = 2.30)  
Halo CE: Complete The Pillar of Autumn.
Unlocked by 33 tracked gamers (69% - TA Ratio = 1.20)  
This is a rare achievementHalo CE: Beat the par score on The Pillar of Autumn.
Unlocked by 7 tracked gamers (15% - TA Ratio = 2.61)  
This is a rare achievementEarn a total of 250 CTF Mode Specific medals in matchmade games.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
Power Play23 (10)
This is a rare achievementHalo 2A MP: On Warlord, get 5 active camouflage power ups in a single game.
Unlocked by 9 tracked gamers (19% - TA Ratio = 2.30)  
Primate13 (5)
This is a rare achievementHalo 3: Find your first missing links.
Unlocked by 7 tracked gamers (15% - TA Ratio = 2.61)  
This is a rare achievementHalo 3: Complete every level of the game on Normal difficulty.
Unlocked by 13 tracked gamers (27% - TA Ratio = 1.92)  
This is a rare achievementHalo 2A MP: Get 25 melee kills in multiplayer.
Unlocked by 10 tracked gamers (21% - TA Ratio = 2.19)  
This is a rare achievementHalo 2: Collect the Didact toy in The Great Journey.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo 2: Complete Quarantine Zone.
Unlocked by 17 tracked gamers (35% - TA Ratio = 1.68)  
This is a rare achievementWin 450 multiplayer games.
Unlocked by 4 tracked gamers (8% - TA Ratio = 3.46)  
This is a rare achievementHalo CE: Activate Terminal 7 on The Library.
Unlocked by 9 tracked gamers (19% - TA Ratio = 2.30)  
This is a rare achievementHalo 4: Beat the par time on Forerunner.
Unlocked by 8 tracked gamers (17% - TA Ratio = 2.44)  
Ranger22 (10)
This is a rare achievementHalo 3: Beat the par score on The Ark.
Unlocked by 10 tracked gamers (21% - TA Ratio = 2.19)  
This is a rare achievementHalo CE: Beat the par score on The Library.
Unlocked by 4 tracked gamers (8% - TA Ratio = 3.46)  
Reclaimer15 (10)
Halo 4: Complete Reclaimer.
Unlocked by 23 tracked gamers (48% - TA Ratio = 1.47)  
This is a rare achievementHalo 2A MP: Win 10 matches on Bloodline in multiplayer.
Unlocked by 9 tracked gamers (19% - TA Ratio = 2.30)  
This is a rare achievementHalo 2: Beat the par time on The Oracle.
Unlocked by 5 tracked gamers (10% - TA Ratio = 3.09)  
Refuge14 (10)
This is a rare achievementHalo 3: Complete The Ark.
Unlocked by 24 tracked gamers (50% - TA Ratio = 1.41)  
Regret17 (10)
This is a rare achievementHalo 2: Complete Regret.
Unlocked by 17 tracked gamers (35% - TA Ratio = 1.68)  
This is a rare achievementHalo 2: Collect the Prophet of Regret toy in Regret.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementKill 1000 Watchers.
Unlocked by 3 tracked gamers (6% - TA Ratio = 4.00)  
Requiem14 (10)
Halo 4: Complete Requiem.
Unlocked by 24 tracked gamers (50% - TA Ratio = 1.41)  
Return13 (10)
This is a rare achievementHalo 3: Complete Halo.
Unlocked by 27 tracked gamers (56% - TA Ratio = 1.33)  
Megg28 (10)
This is a rare achievementHalo CE: It's a sign.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo CE: Activate Terminal 8 on Two Betrayals.
Unlocked by 14 tracked gamers (29% - TA Ratio = 1.85)  
Metropolis14 (10)
Halo 2: Complete Metropolis.
Unlocked by 24 tracked gamers (50% - TA Ratio = 1.41)  
Midnight16 (10)
This is a rare achievementHalo 4: Complete Midnight.
Unlocked by 19 tracked gamers (40% - TA Ratio = 1.58)  
This is a rare achievementHalo 3: Find the poster of the missing man.
Unlocked by 8 tracked gamers (17% - TA Ratio = 2.44)  
This is a rare achievementHalo CE: Activate Terminal 9 on Keyes.
Unlocked by 10 tracked gamers (21% - TA Ratio = 2.19)  
This is a rare achievementHalo 3: 4 vehicles, 1 gap on Legendary using Cowbell, Catch, Thunderstorm, Mythic, and Tough Luck.
Unlocked by 8 tracked gamers (17% - TA Ratio = 2.44)  
This is a rare achievementHalo 2: Collect the Librarian toy in Uprising.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementInscrutable. Mysterious.
Unlocked by 9 tracked gamers (19% - TA Ratio = 2.30)  
This is a rare achievementHalo 3: Watching. Waiting. Plotting.
Unlocked by 7 tracked gamers (15% - TA Ratio = 2.61)  
Monopolized120 (30)
This is a rare achievementHalo 2: Complete all Halo 2 Legendary campaign missions in under 3 hours.
Unlocked by 3 tracked gamers (6% - TA Ratio = 4.00)  
Mortardom35 (10)
This is a rare achievementHalo 4: On Reclaimer, use a Wraith to kill at least four enemy Wraiths on Heroic or Legendary.
Unlocked by 4 tracked gamers (8% - TA Ratio = 3.46)  
This is a rare achievementWin 500 multiplayer games.
Unlocked by 4 tracked gamers (8% - TA Ratio = 3.46)  
MVP20 (10)
This is a rare achievementHalo 2A MP: Finished as the top player on the winning team in a matchmade game.
Unlocked by 12 tracked gamers (25% - TA Ratio = 2.00)  
Naked Tyrant104 (30)
This is a rare achievementHalo 4: Complete the Halo 4 LASO Campaign playlist.
Unlocked by 4 tracked gamers (8% - TA Ratio = 3.46)  
Halo CE: Fight alongside Chips Dubbo and listen to his words of wisdom.
Unlocked by 32 tracked gamers (67% - TA Ratio = 1.22)  
This is a rare achievementHalo 2: Complete the level Regret with the Prophet Birthday Skull activated.
Unlocked by 7 tracked gamers (15% - TA Ratio = 2.61)  
Reviewer12 (5)
This is a rare achievementHalo 2: Activate Terminal 12 on High Charity.
Unlocked by 9 tracked gamers (19% - TA Ratio = 2.30)  
This is a rare achievementEarn a total of 2,500 Assist medals in multiplayer.
Unlocked by 8 tracked gamers (17% - TA Ratio = 2.44)  
This is a rare achievementHalo 2A MP: Kill 5 people with melee from behind in Anniversary matchmaking.
Unlocked by 9 tracked gamers (19% - TA Ratio = 2.30)  
This is a rare achievementHalo 2: Beat the par time on Uprising.
Unlocked by 7 tracked gamers (15% - TA Ratio = 2.61)  
This is a rare achievementComplete 1 mission with the LASO playlist skulls enabled.
Unlocked by 7 tracked gamers (15% - TA Ratio = 2.61)  
Rex Sword28 (10)
This is a rare achievementHalo 2: Grab the energy sword on the level Outskirts.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo 2: Beat the par score on Metropolis.
Unlocked by 9 tracked gamers (19% - TA Ratio = 2.30)  
This is a rare achievementHalo 3: Activate Terminal 1 on The Ark.
Unlocked by 20 tracked gamers (42% - TA Ratio = 1.54)  
This is a rare achievementHalo 2A MP: In Anniversary matchmaking, earn a total of 100 Splatter medals.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
Halo 2A MP: In Anniversary matchmaking, earn a total of 100 Environmentalist medals.
No tracked gamers have this achievement  
This is a rare achievementHalo 2: Beat the par time on Outskirts.
Unlocked by 7 tracked gamers (15% - TA Ratio = 2.61)  
This is a rare achievementHalo 2A MP: Found and destroyed the BLAST soda can on Warlord.
Unlocked by 9 tracked gamers (19% - TA Ratio = 2.30)  
This is a rare achievementHalo CE: Disapprovingly look at Captain Keyes' abandoned pipe.
Unlocked by 5 tracked gamers (10% - TA Ratio = 3.09)  
This is a rare achievementHalo 3: Activate all Halo 3 Terminals.
Unlocked by 8 tracked gamers (17% - TA Ratio = 2.44)  
This is a rare achievementHalo CE: Destroy three of the four Banshees on Halo during a single play-through.
Unlocked by 5 tracked gamers (10% - TA Ratio = 3.09)  
This is a rare achievementHalo 2: Beat the par score on Outskirts.
Unlocked by 4 tracked gamers (8% - TA Ratio = 3.46)  
This is a rare achievementHalo 2: Complete Sacred Icon.
Unlocked by 16 tracked gamers (33% - TA Ratio = 1.73)  
Halo CE: Activate Terminal 2 on Halo.
Unlocked by 16 tracked gamers (33% - TA Ratio = 1.73)  
Obsessed10 (5)
This is a rare achievementHalo 2: Activate Terminal 13 on The Great Journey.
Unlocked by 12 tracked gamers (25% - TA Ratio = 2.00)  
This is a rare achievementComplete three cross-game playlists.
Unlocked by 3 tracked gamers (6% - TA Ratio = 4.00)  
This is a rare achievementHalo 2: Beat the par score on Gravemind.
Unlocked by 3 tracked gamers (6% - TA Ratio = 4.00)  
This is a rare achievementCollect 6,000 campaign or playlist medals.
Unlocked by 15 tracked gamers (31% - TA Ratio = 1.78)  
This is a rare achievementHalo 3: Find the hidden Skull on the Sandbox multiplayer map.
Unlocked by 9 tracked gamers (19% - TA Ratio = 2.30)  
This is a rare achievementHalo 2: Acquire the Scarab Gun.
Unlocked by 5 tracked gamers (10% - TA Ratio = 3.09)  
Oracle16 (10)
Halo 2: Complete The Oracle.
Unlocked by 19 tracked gamers (40% - TA Ratio = 1.58)  
This is a rare achievementKill 1000 Jackals.
Unlocked by 17 tracked gamers (35% - TA Ratio = 1.68)  
This is a rare achievementHalo 3: Find the hidden Skull on the Orbital multiplayer map.
Unlocked by 9 tracked gamers (19% - TA Ratio = 2.30)  
Scholar10 (5)
This is a rare achievementHalo 2: Activate Terminal 11 on Uprising.
Unlocked by 11 tracked gamers (23% - TA Ratio = 2.08)  
This is a rare achievementHalo 2: Beat the par score on High Charity.
Unlocked by 3 tracked gamers (6% - TA Ratio = 4.00)  
Orpheus28 (10)
This is a rare achievementHalo 3: Beat the par score on Cortana.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo CE: Beat the par time on Keyes.
Unlocked by 4 tracked gamers (8% - TA Ratio = 3.46)  
Ouroboros26 (10)
This is a rare achievementHalo 4: Beat the par time on Infinity.
Unlocked by 7 tracked gamers (15% - TA Ratio = 2.61)  
Seconds24 (10)
This is a rare achievementHalo 2: Complete a Halo 2 playlist.
Unlocked by 8 tracked gamers (17% - TA Ratio = 2.44)  
Outskirts14 (10)
Halo 2: Complete Outskirts.
Unlocked by 23 tracked gamers (48% - TA Ratio = 1.44)  
This is a rare achievementHalo CE: Beat the par score on all Halo: CE levels.
Unlocked by 3 tracked gamers (6% - TA Ratio = 4.00)  
This is a rare achievementHalo 4: Beat the par score on Forerunner.
Unlocked by 8 tracked gamers (17% - TA Ratio = 2.44)  
This is a rare achievementHalo CE: Complete the level The Pillar of Autumn on Legendary without picking up an overshield.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
Pacifist35 (10)
This is a rare achievementHalo CE: Finish The Silent Cartographer without shooting, grenades, melee, dying or restarting.
Unlocked by 4 tracked gamers (8% - TA Ratio = 3.46)  
This is a rare achievementEarn a total of 250 Killjoy medals in matchmade games.
Unlocked by 5 tracked gamers (10% - TA Ratio = 3.09)  
Kill 100 Crawlers.
Unlocked by 24 tracked gamers (50% - TA Ratio = 1.41)  
This is a rare achievementWin 150 multiplayer games.
Unlocked by 7 tracked gamers (15% - TA Ratio = 2.61)  
This is a rare achievementHalo 2A MP: On Zenith, personally activate the center energy shield 3 times in one matchmade game.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo 2A MP: Get 30 kills with the Hornet in multiplayer.
Unlocked by 8 tracked gamers (17% - TA Ratio = 2.44)  
This is a rare achievementHalo 4: Beat the par time on Shutdown.
Unlocked by 9 tracked gamers (19% - TA Ratio = 2.30)  
Shutdown15 (10)
This is a rare achievementHalo 4: Complete Shutdown.
Unlocked by 22 tracked gamers (46% - TA Ratio = 1.51)  
This is a rare achievementHalo 3: Beat the par time on The Covenant.
Unlocked by 6 tracked gamers (12% - TA Ratio = 2.82)  
This is a rare achievementHalo 3: This stuff is your history!
Unlocked by 11 tracked gamers (23% - TA Ratio = 2.08)  
This is a rare achievementHalo 3: Beat the par time on all Halo 3 levels.
Unlocked by 5 tracked gamers (10% - TA Ratio = 3.09)