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 Silver "Number 1" medal.
Earned the Onyx "War Supporter" medal.
Executed your enemies with variety and style.
Recovered all 15 COG Tags.
Recovered all 42 Collectibles.
Complete all Acts in 4 player Co-op on any difficulty.
Earned the Bronze "Force Multiplier" medal.
Complete all Acts in Co-op on any difficulty.
Completed all campaign Acts on Hardcore Difficulty.
Completed all campaign Acts on Insane Difficulty.
Your respect for the dead earned you access to Griffin's special weapons stash.
Completed one match in all six Versus multiplayer modes.
Reached level 50.
Completed 5 Arcade Campaign chapters in co-op.
Recovered 20 of 42 Collectibles.
Survived all 50 waves of Horde.
Earned an Onyx medal.
Wreaked vengence upon humanity!
Maxed the Consecutive Match Bonus in Versus multiplayer.
Reached level 25.
Earned the Bronze "Loot Courtesan" medal.
Reached level 15.
Completed the first 12 waves of Beast.
Survived the first 10 waves of Horde.
Reached level 10.
Executed an infected player and is now turning Lambent.
Killed 10 enemies in Team Deathmatch.
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.
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.
Recovered 5 of 42 Collectibles.
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.
Found new places to destroy all humans.
Showed your friends the Horde Command Pack sights.
We are the elite Onyx Guard!
Good ROI on that Silverback upgrade.
The Hammer of Dawn is now online!
Showed 50 Locusts the meaning of sky-fire with HOD Command Center.
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 Arcade Campaign.
Used the Mauler shield to kill 10 Gears that had the temerity to fire upon you and your General.
As RAAM, ripped 50 Gears to shreds with your Kryll.
Completed "RAAM's Shadow" in Standard Campaign.
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 12 waves of Beast on all Fenix Rising maps.
Level 100 - so nice, I did it twice.
Level 100 and going back for more!
Completed all 50 waves of Horde on any of the Fenix Rising maps.
Win a Versus multiplayer match as a team of five Recruit Claytons (any mode).
Win a Versus multiplayer match as a team of five Savage Marauders (any mode).
Earn at least one of each of the original 132 combat ribbons.
Guardian is back!
Completed all 12 waves of Beast on all Forces of Nature maps.
Cleaved 25 enemies with a hidden weapon.
Completed all 50 waves of Horde on any of the Forces of Nature maps.
Found the right man for the job!
Maxed out all of the Horde fortifications.
Complete 20 consecutive waves of Horde on any Forces of Nature map without going down or dying.
Bag and Tag 20 opponents while playing as the Savage Hunter in Versus multiplayer (any 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.