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.
Reached level 50.
Wreaked vengence upon humanity!
Earned the Silver "Number 1" medal.
Executed your enemies with variety and style.
Complete all Acts in 4 player Co-op on any difficulty.
Completed all campaign Acts on Hardcore Difficulty.
Earned an Onyx medal.
Completed all campaign Acts on Insane Difficulty.
Earned the Bronze "Loot Courtesan" medal.
Reached level 25.
Maxed the Consecutive Match Bonus in Versus multiplayer.
Completed one match in all six Versus multiplayer modes.
Reached level 15.
Recovered all 15 COG Tags.
Completed all campaign Acts on Casual or Normal Difficulty.
Complete all Acts in Co-op on any difficulty.
Killed Myrrah.
Rescued Adam Fenix from captivity.
Recovered all 42 Collectibles.
Turned off the Maelstrom device.
Survived the first 10 waves of Horde.
Reached level 10.
Passed under the Maelstrom and found Azura.
Launched the sub.
Found enough fuel to get to Endeavor naval base.
Your respect for the dead earned you access to Griffin's special weapons stash.
Found and activated the fuel pump.
Drove from Anvil Gate to Mercy.
Completed the first 12 waves of Beast.
Killed 10 enemies in Team Deathmatch.
Executed an infected player and is now turning Lambent.
Defeated the Lambent Berserker.
Defended Anvil Gate from the Locust siege.
Recovered 20 of 42 Collectibles.
Arrived safely, kinda, at Anvil Gate.
Grabbed a Locust Gas Barge to travel to Anvil Gate.
Reached level 5.
Discovered the location of Adam Fenix.
Blew up the Lambent Leviathan from the bridge.
Defended and escaped from Cougar Stadium.
Completed 5 Arcade Campaign chapters in co-op.
Found food and ammo in Hanover.
Recovered 5 of 42 Collectibles.
Defended the Raven's Nest from Lambent Leviathan.
Woke up from a bad dream.
Your skill and experience means you’re ready for Standard Versus multiplayer.
Complete all 50 waves of Horde mode (any difficulty, any map).
Earn the Bronze "Force Multiplier" medal.
Reach level 100 and earn every Onyx medal.
Earn the Onyx "War Supporter" medal.
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).
Defeat a Boss Wave as 5 Onyx Guards (Hardcore difficulty).
Get 500 Silverback rocket kills in Horde (any map, any difficulty).
Achieve Level 4 in Horde Command Center fortifications.
Used the Mauler shield to kill 10 Gears that had the temerity to fire upon you and your General.
Showed 50 Locusts the meaning of sky-fire with HOD Command Center.
Ignored all Loader safety guidelines and killed 10 Locusts.
Completed "RAAM's Shadow" in Standard Campaign.
As RAAM, ripped 50 Gears to shreds with your Kryll.
Complete "RAAM's Shadow" in Arcade Campaign on any difficulty.
Complete "RAAM's Shadow" in 4 player co-op in either Arcade or Standard mode.
Play 10 matches of Versus as a member of Zeta (Barrick, Tai, Minh, or Valera)(Standard or Casual).
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.
Won a Versus multiplayer match as a team of five Savage Marauders (any mode).
Complete all 12 waves of Beast on all Fenix Rising maps.
Complete all 50 waves of Horde on any of the Fenix Rising maps.
Win a Versus multiplayer match as a team of five Recruit Claytons (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.
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.
Complete all 50 waves of Horde on any of the Forces of Nature maps.
Get 25 kills with any of the hidden elementally charged Cleavers in Horde.
Achieve the maximum level on all fortifications in Horde mode.
Win a match of Guardian on all Forces of Nature maps.
Build or repair 50,000 worth of fortifications as Mechanic Baird LE.
Bag and Tag 20 opponents while playing as the Savage Hunter in Versus multiplayer (any mode).
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.