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.
Completed one match in all six Versus multiplayer modes.
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 Hardcore Difficulty.
Completed all campaign Acts on Insane Difficulty.
Earned the Silver "Number 1" medal.
Recovered all 42 Collectibles.
Recovered all 15 COG Tags.
Earned the Bronze "Force Multiplier" medal.
Reached level 50.
Completed all campaign Acts on Casual or Normal Difficulty.
Killed Myrrah.
Rescued Adam Fenix from captivity.
Turned off the Maelstrom device.
Passed under the Maelstrom and found Azura.
Your respect for the dead earned you access to Griffin's special weapons stash.
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.
Recovered 20 of 42 Collectibles.
Arrived safely, kinda, at Anvil Gate.
Grabbed a Locust Gas Barge to travel to Anvil Gate.
Discovered the location of Adam Fenix.
Completed 5 Arcade Campaign chapters in co-op.
Earned an Onyx medal.
Executed your enemies with variety and style.
Reached level 25.
Maxed the Consecutive Match Bonus in Versus multiplayer.
Survived all 50 waves of Horde.
Reached level 15.
Executed an infected player and is now turning Lambent.
Killed 10 enemies in Team Deathmatch.
Earned the Bronze "Loot Courtesan" medal.
Reached level 10.
Completed the first 12 waves of Beast.
Wreaked vengence upon humanity!
Survived the first 10 waves of Horde.
Reached level 5.
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.
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.
Found new places to destroy all humans.
Showed your friends the Horde Command Pack sights.
We are the elite Onyx Guard!
The Hammer of Dawn is now online!
Good ROI on that Silverback upgrade.
As RAAM, made sure Minh never forgets that day outside the House of Sovereigns.
Honored the memory of Zeta Squad in 10 matches of Versus.
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 4 player co-op.
Completed "RAAM's Shadow" in Arcade Campaign.
As RAAM, ripped 50 Gears to shreds with your Kryll.
Completed "RAAM's Shadow" in Standard Campaign.
Used the Mauler shield to kill 10 Gears that had the temerity to fire upon you and your General.
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.
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).
Level 100 and going back for more!
Achieve level 100 a second time and choose to re-up for another tour.
Earned all 132 combat ribbons.
Completed all 50 waves of Horde on any of the Forces of Nature maps.
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!
Led by example and killed 10 opponents as Guardian leader.
Guardian is back!
Captured and "released" 20 opponents as the Savage Hunter.
Found the right man for the job!
Cleaved 25 enemies with a hidden weapon.
Maxed out all of the Horde fortifications.