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.
Recovered all 15 COG Tags.
Earned the Onyx "War Supporter" medal.
Recovered all 42 Collectibles.
Reached level 50.
Earned the Silver "Number 1" medal.
Your respect for the dead earned you access to Griffin's special weapons stash.
Wreaked vengence upon humanity!
Survived all 50 waves of Horde.
Completed all campaign Acts on Hardcore Difficulty.
Earned an Onyx medal.
Completed all campaign Acts on Insane Difficulty.
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.
Completed all campaign Acts on Casual or Normal Difficulty.
Discovered the location of Adam Fenix.
Executed your enemies with variety and style.
Blew up the Lambent Leviathan from the bridge.
Defended and escaped from Cougar Stadium.
Killed Myrrah.
Rescued Adam Fenix from captivity.
Recovered 20 of 42 Collectibles.
Turned off the Maelstrom device.
Passed under the Maelstrom and found Azura.
Launched the sub.
Earned the Bronze "Loot Courtesan" medal.
Found enough fuel to get to Endeavor naval base.
Reached level 25.
Completed one match in all six Versus multiplayer modes.
Survived the first 10 waves of Horde.
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.
Grabbed a Locust Gas Barge to travel to Anvil Gate.
Recovered 5 of 42 Collectibles.
Reached level 15.
Completed 5 Arcade Campaign chapters in co-op.
Found food and ammo in Hanover.
Defended the Raven's Nest from Lambent Leviathan.
Woke up from a bad dream.
Maxed the Consecutive Match Bonus in Versus multiplayer.
Reached level 10.
Killed 10 enemies in Team Deathmatch.
Completed the first 12 waves of Beast.
Reached level 5.
Executed an infected player and is now turning Lambent.
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!
Honored the memory of Zeta Squad in 10 matches of Versus.
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.
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.
Showed 50 Locusts the meaning of sky-fire with HOD Command Center.
Completed "RAAM's Shadow" in Arcade Campaign.
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.
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!
Earned all 132 combat ribbons.
Guardian is back!
Led by example and killed 10 opponents as Guardian leader.
Completed all 12 waves of Beast on all Forces of Nature maps.
Completed all 50 waves of Horde on any of the Forces of Nature maps.
The $!*@# was taken down with extreme force.
Cleaved 25 enemies with a hidden weapon.
Found the right man for the job!
Still standing after 20 waves - you're a natural!
Captured and "released" 20 opponents as the Savage Hunter.
Maxed out all of the Horde fortifications.