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.
Complete all Acts in 4 player Co-op on any difficulty.
Completed all campaign Acts on Insane Difficulty.
Earned the Bronze "Force Multiplier" medal.
Completed 5 Arcade Campaign chapters in co-op.
Executed your enemies with variety and style.
Your respect for the dead earned you access to Griffin's special weapons stash.
Reached level 50.
Survived all 50 waves of Horde.
Earned the Bronze "Loot Courtesan" medal.
Survived the first 10 waves of Horde.
Earned an Onyx medal.
Completed one match in all six Versus multiplayer modes.
Recovered all 15 COG Tags.
Complete all Acts in Co-op on any difficulty.
Completed all campaign Acts on Casual or Normal Difficulty.
Completed all campaign Acts on Hardcore Difficulty.
Killed Myrrah.
Rescued Adam Fenix from captivity.
Recovered all 42 Collectibles.
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.
Reached level 25.
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.
Maxed the Consecutive Match Bonus in Versus multiplayer.
Wreaked vengence upon humanity!
Completed the first 12 waves of Beast.
Reached level 15.
Reached level 10.
Killed 10 enemies in Team Deathmatch.
Executed an infected player and is now turning Lambent.
Blew up the Lambent Leviathan from the bridge.
Reached level 5.
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.
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!
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.
Completed "RAAM's Shadow" in Standard Campaign.
Ignored all Loader safety guidelines and killed 10 Locusts.
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.
Honored the memory of Zeta Squad in 10 matches of Versus.
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.
Completed all 50 waves of Horde on any of the 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).
Level 100 - so nice, I did it twice.
Level 100 and going back for more!
Completed all 12 waves of Beast on all Fenix Rising maps.
Earned all 132 combat ribbons.
The $!*@# was taken down with extreme force.
Completed all 12 waves of Beast on all Forces of Nature maps.
Led by example and killed 10 opponents as Guardian leader.
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!
Get 25 kills with any of the hidden elementally charged Cleavers in Horde.
Achieve the maximum level on all fortifications in Horde mode.
Bag and Tag 20 opponents while playing as the Savage Hunter in Versus multiplayer (any mode).