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.
Complete all Acts in 4 player Co-op on any difficulty.
Earned the Bronze "Force Multiplier" medal.
Complete all Acts in Co-op on any difficulty.
Survived all 50 waves of Horde.
Executed your enemies with variety and style.
Completed all campaign Acts on Insane Difficulty.
Reached level 50.
Earned an Onyx medal.
Earned the Silver "Number 1" medal.
Earned the Bronze "Loot Courtesan" medal.
Reached level 25.
Wreaked vengence upon humanity!
Maxed the Consecutive Match Bonus in Versus multiplayer.
Completed the first 12 waves of Beast.
Reached level 15.
Completed one match in all six Versus multiplayer modes.
Executed an infected player and is now turning Lambent.
Killed 10 enemies in Team Deathmatch.
Recovered all 42 Collectibles.
Completed all campaign Acts on Casual or Normal Difficulty.
Completed all campaign Acts on Hardcore Difficulty.
Killed Myrrah.
Rescued Adam Fenix from captivity.
Recovered all 15 COG Tags.
Turned off the Maelstrom device.
Passed under the Maelstrom and found Azura.
Launched the sub.
Completed 5 Arcade Campaign chapters in co-op.
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.
Defeated the Lambent Berserker.
Defended Anvil Gate from the Locust siege.
Arrived safely, kinda, at Anvil Gate.
Reached level 10.
Recovered 20 of 42 Collectibles.
Grabbed a Locust Gas Barge to travel to Anvil Gate.
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.
Reached level 5.
Survived the first 10 waves of Horde.
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.
Reach level 100 and earn every Onyx medal.
We are the elite Onyx Guard!
Found new places to destroy all humans.
Showed your friends the Horde Command Pack sights.
Good ROI on that Silverback upgrade.
The Hammer of Dawn is now online!
As RAAM, made sure Minh never forgets that day outside the House of Sovereigns.
Completed "RAAM's Shadow" in 4 player co-op.
Ignored all Loader safety guidelines and killed 10 Locusts.
Completed "RAAM's Shadow" in Arcade Campaign.
Showed 50 Locusts the meaning of sky-fire with HOD Command Center.
Honored the memory of Zeta Squad in 10 matches of Versus.
Used the Mauler shield to kill 10 Gears that had the temerity to fire upon you and your General.
Completed "RAAM's Shadow" in Standard Campaign.
As RAAM, ripped 50 Gears to shreds with your Kryll.
Defeated the first 10 waves of Horde with every member of Zeta in your party.
Level 100 - so nice, I did it twice.
Level 100 and going back for more!
Completed all 12 waves of Beast on all Fenix Rising maps.
Won a Versus multiplayer match as a team of five Savage Marauders (any mode).
Won a Versus multiplayer match as a team of five Recruit Claytons (any mode).
Completed all 50 waves of Horde on any of the Fenix Rising maps.
Earned all 132 combat ribbons.
Maxed out all of the Horde fortifications.
Completed all 12 waves of Beast on all Forces of Nature maps.
The $!*@# was taken down with extreme force.
Still standing after 20 waves - you're a natural!
Guardian is back!
Led by example and killed 10 opponents as Guardian leader.
Completed all 50 waves of Horde on any of the Forces of Nature maps.
Found the right man for the job!
Cleaved 25 enemies with a hidden weapon.
Captured and "released" 20 opponents as the Savage Hunter.