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.
Complete all Acts in 4 player Co-op on any difficulty.
Earned the Bronze "Force Multiplier" medal.
Earned the Onyx "War Supporter" medal.
Executed your enemies with variety and style.
Completed all campaign Acts on Hardcore Difficulty.
Completed all campaign Acts on Insane Difficulty.
Earned an Onyx medal.
Recovered all 42 Collectibles.
Recovered all 15 COG Tags.
Wreaked vengence upon humanity!
Recovered 20 of 42 Collectibles.
Complete all Acts in Co-op on any difficulty.
Your respect for the dead earned you access to Griffin's special weapons stash.
Survived all 50 waves of Horde.
Earned the Bronze "Loot Courtesan" medal.
Reached level 50.
Completed 5 Arcade Campaign chapters in co-op.
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.
Completed one match in all six Versus multiplayer modes.
Maxed the Consecutive Match Bonus in Versus multiplayer.
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.
Reached level 25.
Survived the first 10 waves of Horde.
Reached level 15.
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.
Reached level 10.
Completed the first 12 waves of Beast.
Killed 10 enemies in Team Deathmatch.
Reached level 5.
Executed an infected player and is now turning Lambent.
Your skill and experience means you’re ready for Standard Versus multiplayer.
Earn the Silver "Number 1" medal.
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.
Get 500 Silverback rocket kills in Horde (any map, any difficulty).
Achieve Level 4 in Horde Command Center fortifications.
Completed "RAAM's Shadow" in Standard Campaign.
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.
Honored the memory of Zeta Squad in 10 matches of Versus.
Completed "RAAM's Shadow" in Arcade Campaign.
Completed "RAAM's Shadow" in 4 player co-op.
As RAAM, ripped 50 Gears to shreds with your Kryll.
Using the Loader, kill 10 Locust.
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 50 waves of Horde on any of the Fenix Rising maps.
Level 100 - so nice, I did it twice.
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).
Earn at least one of each of the original 132 combat ribbons.
Cleaved 25 enemies with a hidden weapon.
Completed all 12 waves of Beast on all Forces of Nature maps.
Captured and "released" 20 opponents as the Savage Hunter.
Found the right man for the job!
Completed all 50 waves of Horde on any of the Forces of Nature maps.
Still standing after 20 waves - you're a natural!
Guardian is back!
Achieve the maximum level on all fortifications in Horde mode.
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.