Full list of all 70 Gears of War: Judgment achievements worth 1,500 gamerscore. It takes around 50-60 hours to unlock all of the achievements in the base game.
The base game contains 50 achievements worth 1,000 Gamerscore, and there are 2 DLC packs containing 20 achievements worth 500 Gamerscore.
Completed all Declassified missions
Attained 75 Stars on at least Normal Difficulty
Earned the Onyx "War Supporter" medal
Earned at least one Onyx medal
Won 10 rounds of Team Deathmatch
Recovered 10 COG Tags during the Campaign
Reached level 40
Won a match on every map in all Versus modes
Won one match on every map in Domination
Won one match on every map in Team Deathmatch
Won one match on every map in Overrun
Won one match on every map in Free For All
Won one match in Free For All, Team Deathmatch, and Domination
Killed with all classes of Locust in Overrun
Reached level 30
Completed Aftermath
Reached level 20
Equipped your first Medal
Completed all Campaign Chapters on at least Casual difficulty
Completed all Campaign Chapters on at least Normal difficulty
Completed Courthouse
Completed Downtown Halvo Bay
Completed Onyx Point
Completed at least 20 Declassified missions
Watched Aftermath teaser
Completed Seahorse Hills
Attained 50 Stars on at least Casual Difficulty
Unlocked Aftermath
Reached level 10
Completed Halvo Bay Military Academy
Earned 3 unique Ribbons in any section
Played any section in 4 player Co-Op
Completed Museum Of Military Glory
Killed with all classes of COG in Overrun or Survival
Reached level 5
Completed your first Declassified mission
Complete all Campaign Chapters on at least Hardcore difficulty
Complete all Campaign Chapters on Insane difficulty
Complete all Campaign Chapters in Co-op
Attain 100 Stars on at least Hardcore Difficulty
Attain all Stars on Insane Difficulty
Recover 25 COG Tags during the Campaign
Recover all 48 COG Tags during the Campaign
Complete all Declassified Missions on Insane difficulty
Reach level 50
Achieve level 50 and choose to re-up for another tour of duty
Achieve level 50 a second time and choose to re-up for another tour
Achieve level 50 a third time and choose to re-up for another tour
Complete wave 10 on all maps in Survival mode
Win 10 matches of Overrun
Earn 50 Double ribbons with the Booshka on Terminal
Revive 100 total teammates on Terminal as a Medic
Get a Double while emerging as a Corpser
Kill 100 enemies with each Locust
Win Hardcore Survival on Terminal with 5 Soldiers
Earn a killing spree with the Boomshield on Boneyard
Earn the You’re It ribbon on Boneyard
Play 10 matches total on BloodDrive
Place first in Free For All in Boneyard 5 times
Win a Team Death Match game with the entire team wearing the Car 13 Armor skin
Earn the Tree House Predator ribbon on Ward
Destroy the generator in under 8 minutes on any DLC map
Get a multi-kill while playing as an enraged Rager on Ward
Finish wave 10 of Survival at the first e-hole on Ward on at least Normal difficulty
Score a flag cap on Streets, Rig, Gondola, Library, Lost City, Museum, and Checkout
Get a kill with each pickup weapon in FFA during a single game on the map Lost City
Kill the flag carrier a total of 20 times
Win a TDM, DOM, and BT match with your entire team wearing the UIR Armor skin
Score 5 flags in BT as Paduk
Win public/ranked game of Execution on Museum with all players using Gold character and weapon skins