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.
Earned the Silver "Number 1" medal.
Executed your enemies with variety and style.
Recovered all 15 COG Tags.
Completed all campaign Acts on Hardcore Difficulty.
Completed all campaign Acts on Insane Difficulty.
Recovered all 42 Collectibles.
Earned an Onyx medal.
Survived all 50 waves of Horde.
Earned the Bronze "Loot Courtesan" medal.
Survived the first 10 waves of Horde.
Reached level 50.
Earned the Bronze "Force Multiplier" medal.
Completed 5 Arcade Campaign chapters in co-op.
Your respect for the dead earned you access to Griffin's special weapons stash.
Completed the first 12 waves of Beast.
Wreaked vengence upon humanity!
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.
Turned off the Maelstrom device.
Passed under the Maelstrom and found Azura.
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.
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.
Reached level 25.
Maxed the Consecutive Match Bonus in Versus multiplayer.
Completed one match in all six Versus multiplayer modes.
Reached level 15.
Reached level 10.
Reached level 5.
Executed an infected player and is now turning Lambent.
Killed 10 enemies in Team Deathmatch.
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!
Get 500 Silverback rocket kills in Horde (any map, any difficulty).
Achieve Level 4 in Horde Command Center fortifications.
Ignored all Loader safety guidelines and killed 10 Locusts.
Showed 50 Locusts the meaning of sky-fire with HOD Command Center.
As RAAM, made sure Minh never forgets that day outside the House of Sovereigns.
Completed "RAAM's Shadow" in Arcade Campaign.
Completed "RAAM's Shadow" in 4 player co-op.
Completed "RAAM's Shadow" in Standard Campaign.
As RAAM, ripped 50 Gears to shreds with your Kryll.
Honored the memory of Zeta Squad in 10 matches of Versus.
As Mauler, kill 10 Gears by reflecting their bullets using your shield.
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.
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 12 waves of Beast on all Fenix Rising maps.
Level 100 and going back for more!
Earn at least one of each of the original 132 combat ribbons.
Led by example and killed 10 opponents as Guardian leader.
Cleaved 25 enemies with a hidden weapon.
Found the right man for the job!
Guardian is back!
Captured and "released" 20 opponents as the Savage Hunter.
Complete all 12 waves of Beast on all Forces of Nature maps.
Complete 20 consecutive waves of Horde on any Forces of Nature map without going down or dying.
Complete all 50 waves of Horde on any of the Forces of Nature maps.
Achieve the maximum level on all fortifications in Horde mode.
Kill a Lambent Berserker with a team comprised of 5 Forces of Nature characters in Horde.