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