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.
Recovered 20 of 42 Collectibles.
Earned an Onyx medal.
Your respect for the dead earned you access to Griffin's special weapons stash.
Completed 5 Arcade Campaign chapters in co-op.
Wreaked vengence upon humanity!
Defended the Raven's Nest from Lambent Leviathan.
Found food and ammo in Hanover.
Reached level 25.
Completed the first 12 waves of Beast.
Earned the Bronze "Loot Courtesan" medal.
Reached level 15.
Survived the first 10 waves of Horde.
Maxed the Consecutive Match Bonus in Versus multiplayer.
Reached level 10.
Killed 10 enemies in Team Deathmatch.
Executed an infected player and is now turning Lambent.
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.
Woke up from a bad dream.
Your skill and experience means you’re ready for Standard Versus multiplayer.
Complete all campaign Acts on Hardcore Difficulty (Standard or Arcade).
Complete all campaign Acts on Insane Difficulty (Standard or Arcade).
Recover all 42 Campaign Collectibles (any difficulty, Standard or Arcade).
Recover all 15 COG Tags during the Campaign (any difficulty, Standard or Arcade).
Complete all Campaign Acts in Co-op (any difficulty, Standard or Arcade).
Complete all Campaign Acts in 4 player Co-op (any difficulty, Standard or Arcade).
Reach level 50.
Get a kill with every possible execution finishing move (any mode).
Complete all 50 waves of Horde mode (any difficulty, any map).
Earn the Bronze "Force Multiplier" medal.
Earn the Silver "Number 1" medal.
Reach level 100 and earn every Onyx medal.
Complete one match of all six Versus game modes (Standard or Casual).
Earn the Onyx "War Supporter" medal.
Host a private Horde Match with a party of 5 players on any Horde Command Pack map (any difficulty).
Host a private Beast Match with a party of 5 players on any Horde Command Pack map (any difficulty).
Defeat a Boss Wave as 5 Onyx Guards (Hardcore difficulty).
Good ROI on that Silverback upgrade.
Achieve Level 4 in Horde Command Center fortifications.
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.
Complete "RAAM's Shadow" in 4 player co-op in either Arcade or Standard mode.
As Mauler, kill 10 Gears by reflecting their bullets using your shield.
Using the Hammer of Dawn Command Center, kill 50 Locust.
Using the Loader, kill 10 Locust.
Play 10 matches of Versus as a member of Zeta (Barrick, Tai, Minh, or Valera)(Standard or Casual).
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.
Complete 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).
Achieve level 100 and choose to re-up for another tour of duty.
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.
Found the right man for the job!
Complete all 12 waves of Beast on all Forces of Nature maps.
Complete 20 consecutive waves of Horde on any Forces of Nature map without going down or dying.
Complete all 50 waves of Horde on any of the Forces of Nature maps.
Get 25 kills with any of the hidden elementally charged Cleavers in Horde.
Achieve the maximum level on all fortifications in Horde mode.
Win a match of Guardian on all Forces of Nature maps.
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.