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 Silver "Number 1" medal.
Earned the Bronze "Force Multiplier" medal.
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.
Earned an Onyx medal.
Completed all campaign Acts on Insane Difficulty.
Reached level 25.
Earned the Bronze "Loot Courtesan" medal.
Survived all 50 waves of Horde.
Recovered all 42 Collectibles.
Recovered all 15 COG Tags.
Survived the first 10 waves of Horde.
Completed one match in all six Versus multiplayer modes.
Wreaked vengence upon humanity!
Completed the first 12 waves of Beast.
Maxed the Consecutive Match Bonus in Versus multiplayer.
Reached level 15.
Completed 5 Arcade Campaign chapters in co-op.
Recovered 20 of 42 Collectibles.
Completed all campaign Acts on Casual or Normal Difficulty.
Killed Myrrah.
Rescued Adam Fenix from captivity.
Executed your enemies with variety and style.
Turned off the Maelstrom device.
Passed under the Maelstrom and found Azura.
Launched the sub.
Reached level 10.
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.
Recovered 5 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.
Blew up the Lambent Leviathan from the bridge.
Defended and escaped from Cougar Stadium.
Reached level 5.
Found food and ammo in Hanover.
Defended the Raven's Nest from Lambent Leviathan.
Woke up from a bad dream.
Killed 10 enemies in Team Deathmatch.
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.
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.
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.
Completed "RAAM's Shadow" in 4 player co-op.
Completed "RAAM's Shadow" in Standard Campaign.
Ignored all Loader safety guidelines and killed 10 Locusts.
Showed 50 Locusts the meaning of sky-fire with HOD Command Center.
Completed "RAAM's Shadow" in Arcade 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!
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.
Completed all 12 waves of Beast on all Fenix Rising maps.
Earned all 132 combat ribbons.
Maxed out all of the Horde fortifications.
Led by example and killed 10 opponents as Guardian leader.
Guardian is back!
Captured and "released" 20 opponents as the Savage Hunter.
Completed all 12 waves of Beast on all Forces of Nature maps.
Cleaved 25 enemies with a hidden weapon.
Found the right man for the job!
The $!*@# was taken down with extreme force.
Completed all 50 waves of Horde on any of the Forces of Nature maps.
Still standing after 20 waves - you're a natural!