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.
Reached level 50.
Executed your enemies with variety and style.
Maxed the Consecutive Match Bonus in Versus multiplayer.
Earned the Silver "Number 1" medal.
Recovered all 42 Collectibles.
Recovered all 15 COG Tags.
Completed all campaign Acts on Hardcore Difficulty.
Completed all campaign Acts on Insane Difficulty.
Complete all Acts in Co-op on any difficulty.
Complete all Acts in 4 player Co-op on any difficulty.
Your respect for the dead earned you access to Griffin's special weapons stash.
Recovered 20 of 42 Collectibles.
Reached level 25.
Completed 5 Arcade Campaign chapters in co-op.
Earned the Bronze "Force Multiplier" medal.
Earned an Onyx medal.
Completed one match in all six Versus multiplayer modes.
Earned the Bronze "Loot Courtesan" medal.
Survived all 50 waves of Horde.
Reached level 15.
Survived the first 10 waves of Horde.
Wreaked vengence upon humanity!
Reached level 10.
Completed the first 12 waves of Beast.
Killed 10 enemies in Team Deathmatch.
Executed an infected player and is now turning Lambent.
Completed all campaign Acts on Casual or Normal Difficulty.
Killed Myrrah.
Rescued Adam Fenix from captivity.
Recovered 5 of 42 Collectibles.
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.
Reached level 5.
Defended Anvil Gate from the Locust siege.
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.
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.
Earn the Onyx "War Supporter" 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!
Honored the memory of Zeta Squad in 10 matches of Versus.
Completed "RAAM's Shadow" in Arcade 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 Standard Campaign.
As RAAM, ripped 50 Gears to shreds with your Kryll.
Complete "RAAM's Shadow" in 4 player co-op in either Arcade or Standard mode.
As Mauler, kill 10 Gears by reflecting their bullets using your shield.
As RAAM, execute Minh 10 times in Versus MP (Standard or Casual).
Defeated the first 10 waves of Horde with every member of Zeta in your party.
Completed all 12 waves of Beast on all Fenix Rising maps.
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).
Achieve level 100 and choose to re-up for another tour of duty.
Achieve level 100 a second time and choose to re-up for another tour.
Earn at least one of each of the original 132 combat ribbons.
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.
Guardian is back!
Cleaved 25 enemies with a hidden weapon.
Still standing after 20 waves - you're a natural!
Found the right man for the job!
Captured and "released" 20 opponents as the Savage Hunter.
Maxed out all of the Horde fortifications.
Kill 10 opponents as the leader in a round of Guardian on a Forces of Nature map.
Kill a Lambent Berserker with a team comprised of 5 Forces of Nature characters in Horde.