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.
Maxed the Consecutive Match Bonus in Versus multiplayer.
Executed an infected player and is now turning Lambent.
Wreaked vengence upon humanity!
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 Insane Difficulty.
Recovered 20 of 42 Collectibles.
Your respect for the dead earned you access to Griffin's special weapons stash.
Completed 5 Arcade Campaign chapters in co-op.
Killed 10 enemies in Team Deathmatch.
Reached level 50.
Completed one match in all six Versus multiplayer modes.
Survived all 50 waves of Horde.
Earned an Onyx medal.
Completed all campaign Acts on Casual or Normal Difficulty.
Completed all campaign Acts on Hardcore Difficulty.
Killed Myrrah.
Rescued Adam Fenix from captivity.
Reached level 25.
Turned off the Maelstrom device.
Passed under the Maelstrom and found Azura.
Launched the sub.
Reached level 15.
Earned the Bronze "Loot Courtesan" medal.
Found enough fuel to get to Endeavor naval base.
Reached level 10.
Found and activated the fuel pump.
Recovered 5 of 42 Collectibles.
Drove from Anvil Gate to Mercy.
Defeated the Lambent Berserker.
Completed the first 12 waves of Beast.
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.
Defended and escaped from Cougar Stadium.
Found food and ammo in Hanover.
Defended the Raven's Nest from Lambent Leviathan.
Woke up from a bad dream.
Reached level 5.
Survived the first 10 waves of Horde.
Your skill and experience means you’re ready for Standard Versus multiplayer.
Recover all 42 Campaign Collectibles (any difficulty, Standard or Arcade).
Recover all 15 COG Tags during the Campaign (any difficulty, Standard or Arcade).
Get a kill with every possible execution finishing move (any mode).
Reach level 100 and earn every Onyx medal.
Showed your friends the Horde Command Pack sights.
We are the elite Onyx Guard!
Host a private Beast Match with a party of 5 players on any Horde Command Pack map (any difficulty).
The Hammer of Dawn is now online!
Get 500 Silverback rocket kills in Horde (any map, any difficulty).
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 4 player co-op.
Completed "RAAM's Shadow" in Arcade Campaign.
Showed 50 Locusts the meaning of sky-fire with HOD Command Center.
Completed "RAAM's Shadow" in Standard Campaign.
As RAAM, ripped 50 Gears to shreds with your Kryll.
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 - so nice, I did it twice.
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).
Earn at least one of each of the original 132 combat ribbons.
The $!*@# was taken down with extreme force.
Completed all 50 waves of Horde on any of the Forces of Nature maps.
Found the right man for the job!
Maxed out all of the Horde fortifications.
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.
Get 25 kills with any of the hidden elementally charged Cleavers in Horde.
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.