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 Onyx "War Supporter" medal.
Reached level 50.
Earned the Bronze "Force Multiplier" medal.
Your respect for the dead earned you access to Griffin's special weapons stash.
Complete all Acts in 4 player Co-op on any difficulty.
Complete all Acts in Co-op on any difficulty.
Completed all campaign Acts on Casual or Normal Difficulty.
Completed all campaign Acts on Hardcore Difficulty.
Earned an Onyx medal.
Completed all campaign Acts on Insane Difficulty.
Killed Myrrah.
Rescued Adam Fenix from captivity.
Recovered all 42 Collectibles.
Recovered all 15 COG Tags.
Turned off the Maelstrom device.
Passed under the Maelstrom and found Azura.
Launched the sub.
Found enough fuel to get to Endeavor naval base.
Found and activated the fuel pump.
Drove from Anvil Gate to Mercy.
Defeated the Lambent Berserker.
Defended Anvil Gate from the Locust siege.
Arrived safely, kinda, at Anvil Gate.
Recovered 20 of 42 Collectibles.
Grabbed a Locust Gas Barge to travel to Anvil Gate.
Reached level 25.
Discovered the location of Adam Fenix.
Blew up the Lambent Leviathan from the bridge.
Defended and escaped from Cougar Stadium.
Found food and ammo in Hanover.
Recovered 5 of 42 Collectibles.
Completed 5 Arcade Campaign chapters in co-op.
Survived all 50 waves of Horde.
Reached level 15.
Wreaked vengence upon humanity!
Earned the Bronze "Loot Courtesan" medal.
Defended the Raven's Nest from Lambent Leviathan.
Woke up from a bad dream.
Reached level 10.
Completed one match in all six Versus multiplayer modes.
Maxed the Consecutive Match Bonus in Versus multiplayer.
Executed an infected player and is now turning Lambent.
Survived the first 10 waves of Horde.
Completed the first 12 waves of Beast.
Reached level 5.
Killed 10 enemies in Team Deathmatch.
Your skill and experience means you’re ready for Standard Versus multiplayer.
Get a kill with every possible execution finishing move (any mode).
Earn the Silver "Number 1" medal.
Reach level 100 and earn every Onyx medal.
Found new places to destroy all humans.
We are the elite Onyx Guard!
Showed your friends the Horde Command Pack sights.
Good ROI on that Silverback upgrade.
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.
Honored the memory of Zeta Squad in 10 matches of Versus.
Ignored all Loader safety guidelines and killed 10 Locusts.
Completed "RAAM's Shadow" in 4 player co-op.
Completed "RAAM's Shadow" in Standard Campaign.
Showed 50 Locusts the meaning of sky-fire with HOD Command Center.
As RAAM, ripped 50 Gears to shreds with your Kryll.
Completed "RAAM's Shadow" in Arcade Campaign.
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 12 waves of Beast on all Fenix Rising maps.
Won a Versus multiplayer match as a team of five Recruit Claytons (any mode).
Won a Versus multiplayer match as a team of five Savage Marauders (any mode).
Completed all 50 waves of Horde on any of the Fenix Rising maps.
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.
Earned all 132 combat ribbons.
Found the right man for the job!
Captured and "released" 20 opponents as the Savage Hunter.
Completed all 50 waves of Horde on any of the Forces of Nature maps.
Still standing after 20 waves - you're a natural!
Cleaved 25 enemies with a hidden weapon.
Complete all 12 waves of Beast on all Forces of Nature maps.
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.