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 Bronze "Force Multiplier" medal.
Earned the Silver "Number 1" medal.
Killed 10 enemies in Team Deathmatch.
Wreaked vengence upon humanity!
Completed the first 12 waves of Beast.
Survived all 50 waves of Horde.
Earned the Bronze "Loot Courtesan" 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.
Completed all campaign Acts on Insane Difficulty.
Reached level 50.
Completed one match in all six Versus multiplayer modes.
Completed 5 Arcade Campaign chapters in co-op.
Recovered all 42 Collectibles.
Your respect for the dead earned you access to Griffin's special weapons stash.
Completed all campaign Acts on Casual or Normal Difficulty.
Killed Myrrah.
Rescued Adam Fenix from captivity.
Recovered all 15 COG Tags.
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.
Arrived safely, kinda, at Anvil Gate.
Recovered 20 of 42 Collectibles.
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.
Executed an infected player and is now turning Lambent.
Reached level 25.
Reached level 15.
Survived the first 10 waves of Horde.
Earned the Onyx "War Supporter" medal.
Earned an Onyx medal.
Reached level 5.
Reached level 10.
Your skill and experience means you’re ready for Standard Versus multiplayer.
Get a kill with every possible execution finishing move (any mode).
Reach level 100 and earn every Onyx medal.
Earn the maximum Consecutive Match Bonus in Versus multiplayer (Standard or Casual).
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.
Achieve Level 4 in Horde Command Center fortifications.
Honored the memory of Zeta Squad in 10 matches of Versus.
Showed 50 Locusts the meaning of sky-fire with HOD Command Center.
Completed "RAAM's Shadow" in Standard Campaign.
Used the Mauler shield to kill 10 Gears that had the temerity to fire upon you and your General.
Completed "RAAM's Shadow" in 4 player co-op.
Completed "RAAM's Shadow" in Arcade Campaign.
As RAAM, ripped 50 Gears to shreds with your Kryll.
Ignored all Loader safety guidelines and killed 10 Locusts.
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.
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 12 waves of Beast on all Fenix Rising maps.
Completed all 50 waves of Horde on any of the Fenix Rising maps.
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.
Captured and "released" 20 opponents as the Savage Hunter.
Guardian is back!
Found the right man for the job!
The $!*@# was taken down with extreme force.
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.
Still standing after 20 waves - you're a natural!
Get 25 kills with any of the hidden elementally charged Cleavers in Horde.
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.