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.
Completed all campaign Acts on Casual or Normal Difficulty.
Completed all campaign Acts on Hardcore Difficulty.
Complete all Acts in Co-op on any difficulty.
Complete all Acts in 4 player Co-op on any difficulty.
Killed Myrrah.
Rescued Adam Fenix from captivity.
Recovered all 42 Collectibles.
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.
Your respect for the dead earned you access to Griffin's special weapons stash.
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.
Completed 5 Arcade Campaign chapters in co-op.
Executed your enemies with variety and style.
Reached level 50.
Maxed the Consecutive Match Bonus in Versus multiplayer.
Completed one match in all six Versus multiplayer modes.
Discovered the location of Adam Fenix.
Blew up the Lambent Leviathan from the bridge.
Earned the Bronze "Loot Courtesan" medal.
Earned an Onyx medal.
Reached level 25.
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.
Wreaked vengence upon humanity!
Survived all 50 waves of Horde.
Completed the first 12 waves of Beast.
Reached level 15.
Woke up from a bad dream.
Reached level 10.
Reached level 5.
Killed 10 enemies in Team Deathmatch.
Executed an infected player and is now turning Lambent.
Survived the first 10 waves of Horde.
Your skill and experience means you’re ready for Standard Versus multiplayer.
Complete all campaign Acts on Insane Difficulty (Standard or Arcade).
Earn the Silver "Number 1" medal.
Reach level 100 and earn every Onyx medal.
Earn the Onyx "War Supporter" medal.
Found new places to destroy all humans.
Showed your friends the Horde Command Pack sights.
We are the elite Onyx Guard!
The Hammer of Dawn is now online!
Get 500 Silverback rocket kills in Horde (any map, any difficulty).
As RAAM, made sure Minh never forgets that day outside the House of Sovereigns.
Honored the memory of Zeta Squad in 10 matches of Versus.
Completed "RAAM's Shadow" in 4 player co-op.
Used the Mauler shield to kill 10 Gears that had the temerity to fire upon you and your General.
Ignored all Loader safety guidelines and killed 10 Locusts.
Completed "RAAM's Shadow" in Standard Campaign.
As RAAM, ripped 50 Gears to shreds with your Kryll.
Complete "RAAM's Shadow" in Arcade Campaign on any difficulty.
Using the Hammer of Dawn Command Center, kill 50 Locust.
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.
Level 100 and going back for more!
Completed all 12 waves of Beast on all 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).
Earned all 132 combat ribbons.
Completed all 12 waves of Beast on all Forces of Nature maps.
Found the right man for the job!
Cleaved 25 enemies with a hidden weapon.
Led by example and killed 10 opponents as Guardian leader.
Guardian is back!
Captured and "released" 20 opponents as the Savage Hunter.
Still standing after 20 waves - you're a natural!
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.