Full list of all 82 Gears of War 3 achievements worth 2,000 gamerscore. It takes around 1000 hours to unlock all of the achievements in the base game.
The base game contains 50 achievements worth 1,000 Gamerscore, and there are 7 DLC packs containing 32 achievements worth 1,000 Gamerscore.
Earned the Silver "Number 1" medal.
Earned the Bronze "Force Multiplier" medal.
Completed all campaign Acts on Hardcore Difficulty.
Completed all campaign Acts on Insane Difficulty.
Completed one match in all six Versus multiplayer modes.
Reached level 50.
Earned an Onyx medal.
Wreaked vengence upon humanity!
Killed 10 enemies in Team Deathmatch.
Executed your enemies with variety and style.
Reached level 25.
Complete all Acts in Co-op on any difficulty.
Survived all 50 waves of Horde.
Earned the Bronze "Loot Courtesan" medal.
Reached level 15.
Completed the first 12 waves of Beast.
Completed 5 Arcade Campaign chapters in co-op.
Recovered all 42 Collectibles.
Recovered all 15 COG Tags.
Reached level 10.
Rescued Adam Fenix from captivity.
Killed Myrrah.
Completed all campaign Acts on Casual or Normal Difficulty.
Found and activated the fuel pump.
Found enough fuel to get to Endeavor naval base.
Launched the sub.
Passed under the Maelstrom and found Azura.
Turned off the Maelstrom device.
Your respect for the dead earned you access to Griffin's special weapons stash.
Recovered 20 of 42 Collectibles.
Executed an infected player and is now turning Lambent.
Arrived safely, kinda, at Anvil Gate.
Defended Anvil Gate from the Locust siege.
Defeated the Lambent Berserker.
Drove from Anvil Gate to Mercy.
Woke up from a bad dream.
Defended the Raven's Nest from Lambent Leviathan.
Found food and ammo in Hanover.
Defended and escaped from Cougar Stadium.
Blew up the Lambent Leviathan from the bridge.
Discovered the location of Adam Fenix.
Grabbed a Locust Gas Barge to travel to Anvil Gate.
Recovered 5 of 42 Collectibles.
Reached level 5.
Survived the first 10 waves of Horde.
Your skill and experience means you’re ready for Standard Versus multiplayer.
Complete all Campaign Acts in 4 player Co-op (any difficulty, Standard or Arcade).
Reach level 100 and earn every Onyx medal.
Earn the maximum Consecutive Match Bonus in Versus multiplayer (Standard or Casual).
Earn the Onyx "War Supporter" medal.
We are the elite Onyx Guard!
Host a private Horde Match with a party of 5 players on any Horde Command Pack map (any difficulty).
Host a private Beast Match with a party of 5 players on any Horde Command Pack map (any difficulty).
Get 500 Silverback rocket kills in Horde (any map, any difficulty).
Achieve Level 4 in Horde Command Center fortifications.
Completed "RAAM's Shadow" in 4 player co-op.
Used the Mauler shield to kill 10 Gears that had the temerity to fire upon you and your General.
Honored the memory of Zeta Squad in 10 matches of Versus.
Completed "RAAM's Shadow" in Arcade Campaign.
Ignored all Loader safety guidelines and killed 10 Locusts.
Showed 50 Locusts the meaning of sky-fire with HOD Command Center.
Completed "RAAM's Shadow" in Standard Campaign.
As RAAM, ripped 50 Gears to shreds with your Kryll.
As RAAM, execute Minh 10 times in Versus MP (Standard or Casual).
Defeated the first 10 waves of Horde with every member of Zeta in your party.
Completed all 50 waves of Horde on any of the Fenix Rising maps.
Complete all 12 waves of Beast on all Fenix Rising maps.
Win a Versus multiplayer match as a team of five Recruit Claytons (any mode).
Win a Versus multiplayer match as a team of five Savage Marauders (any mode).
Achieve level 100 and choose to re-up for another tour of duty.
Achieve level 100 a second time and choose to re-up for another tour.
Earn at least one of each of the original 132 combat ribbons.
Completed all 50 waves of Horde on any of the Forces of Nature maps.
Cleaved 25 enemies with a hidden weapon.
Found the right man for the job!
Captured and "released" 20 opponents as the Savage Hunter.
Complete all 12 waves of Beast on all Forces of Nature maps.
Complete 20 consecutive waves of Horde on any Forces of Nature map without going down or dying.
Achieve the maximum level on all fortifications in Horde mode.
Win a match of Guardian on all Forces of Nature maps.
Kill 10 opponents as the leader in a round of Guardian on a Forces of Nature map.
Kill a Lambent Berserker with a team comprised of 5 Forces of Nature characters in Horde.