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