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.
Earned the Bronze "Force Multiplier" 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 Casual or Normal Difficulty.
Completed all campaign Acts on Hardcore Difficulty.
Completed all campaign Acts on Insane 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.
Executed your enemies with variety and style.
Reached level 50.
Found enough fuel to get to Endeavor naval base.
Earned an Onyx medal.
Killed 10 enemies in Team Deathmatch.
Reached level 25.
Earned the Bronze "Loot Courtesan" medal.
Maxed the Consecutive Match Bonus in Versus multiplayer.
Survived all 50 waves of Horde.
Reached level 15.
Your respect for the dead earned you access to Griffin's special weapons stash.
Found and activated the fuel pump.
Recovered 20 of 42 Collectibles.
Drove from Anvil Gate to Mercy.
Defeated the Lambent Berserker.
Defended Anvil Gate from the Locust siege.
Arrived safely, kinda, at Anvil Gate.
Grabbed a Locust Gas Barge to travel to Anvil Gate.
Discovered the location of Adam Fenix.
Blew up the Lambent Leviathan from the bridge.
Completed the first 12 waves of Beast.
Wreaked vengence upon humanity!
Reached level 10.
Survived the first 10 waves of Horde.
Completed one match in all six Versus multiplayer modes.
Reached level 5.
Executed an infected player and is now turning Lambent.
Defended and escaped from Cougar Stadium.
Completed 5 Arcade Campaign chapters in co-op.
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.
We are the elite Onyx Guard!
Showed your friends the Horde Command Pack sights.
Host a private Beast Match with a party of 5 players on any Horde Command Pack map (any difficulty).
Get 500 Silverback rocket kills in Horde (any map, any difficulty).
Achieve Level 4 in Horde Command Center fortifications.
Honored the memory of Zeta Squad in 10 matches of Versus.
Used the Mauler shield to kill 10 Gears that had the temerity to fire upon you and your General.
Completed "RAAM's Shadow" in Standard Campaign.
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.
Using the Hammer of Dawn Command Center, kill 50 Locust.
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.
Level 100 and going back for more!
Completed all 50 waves of Horde on any of the Fenix Rising maps.
Complete all 12 waves of Beast on all 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).
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.
Guardian is back!
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.
Captured and "released" 20 opponents as the Savage Hunter.
Still standing after 20 waves - you're a natural!
Found the right man for the job!
Cleaved 25 enemies with a hidden weapon.
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.
Kill a Lambent Berserker with a team comprised of 5 Forces of Nature characters in Horde.