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 Onyx "War Supporter" medal.
Earned the Silver "Number 1" medal.
Executed your enemies with variety and style.
Earned the Bronze "Force Multiplier" medal.
Completed all campaign Acts on Insane Difficulty.
Earned an Onyx medal.
Completed 5 Arcade Campaign chapters in co-op.
Reached level 50.
Survived all 50 waves of Horde.
Earned the Bronze "Loot Courtesan" medal.
Your respect for the dead earned you access to Griffin's special weapons stash.
Survived the first 10 waves of Horde.
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.
Killed Myrrah.
Rescued Adam Fenix from captivity.
Recovered all 42 Collectibles.
Recovered all 15 COG Tags.
Turned off the Maelstrom device.
Wreaked vengence upon humanity!
Completed the first 12 waves of Beast.
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.
Reached level 25.
Blew up the Lambent Leviathan from the bridge.
Completed one match in all six Versus multiplayer modes.
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.
Reached level 15.
Woke up from a bad dream.
Maxed the Consecutive Match Bonus in Versus multiplayer.
Reached level 10.
Executed an infected player and is now turning Lambent.
Reached level 5.
Killed 10 enemies in Team Deathmatch.
Your skill and experience means you’re ready for Standard Versus multiplayer.
Complete all Campaign Acts in 4 player Co-op (any difficulty, Standard or Arcade).
Reach level 100 and earn every Onyx medal.
Showed your friends the Horde Command Pack sights.
We are the elite Onyx Guard!
Found new places to destroy all humans.
Get 500 Silverback rocket kills in Horde (any map, any difficulty).
Achieve Level 4 in Horde Command Center fortifications.
As RAAM, made sure Minh never forgets that day outside the House of Sovereigns.
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.
Ignored all Loader safety guidelines and killed 10 Locusts.
Completed "RAAM's Shadow" in Standard Campaign.
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 Arcade Campaign.
As RAAM, ripped 50 Gears to shreds with your Kryll.
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.
Completed all 12 waves of Beast on all Fenix Rising maps.
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).
Level 100 and going back for more!
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.
Completed all 50 waves of Horde on any of the Forces of Nature maps.
The $!*@# was taken down with extreme force.
Still standing after 20 waves - you're a natural!
Cleaved 25 enemies with a hidden weapon.
Found the right man for the job!
Led by example and killed 10 opponents as Guardian leader.
Guardian is back!
Complete all 12 waves of Beast on all Forces of Nature maps.
Achieve the maximum level on all fortifications in Horde mode.