Here is the full list of all 56 Gears of War: Ultimate Edition achievements worth 1,250 gamerscore.
Reunited with Baird and Cole inside the Imulsion Factory
Read one full comic
Completed 100 matches in ring-based game types and captured 3 objectives in each match
Won 20 rounds in ring-based game types by shutting out the opposing team
Defended Stranded Settlement and headed to Lethia Imulsion Factory
Got the Junker at Chap's gas station
Used the spotlight as protection from the Kryll
Completed 10 different chapters in co-op
Made a Deal with Franklin
Closed all 4 e-holes around the fountain in Fish in a Barrel without any Locust fully emerging
Recovered 11 COG tags
Killed the Berserker in the Tomb of the Unknown
Rescued Damon Baird from the Tomb of the Unknown
Won a match on every Versus map
Reached Level 100 and re-upped
Rescued Augustus Cole in the House of Sovereigns
Won a match in every Versus game type
Won 25 matches in Team Deathmatch
Killed an enemy with every weapon in Versus
Won 25 matches in Boxes
Revived 100 teammates in Versus multiplayer
Spotted 100 enemies ending in an assisted kill in Versus
Won 10 Versus matches without losing a round
Reached level 25
Reached level 10
Finished with the highest points in a Versus match
Reached level 5
Played one Versus Match with a Custom Weapon Skin
Finished playing a Versus match
Performed 5 perfect active reloads in a row
Completed 1 co-op chapter in co-op
Performed 25 perfect active reloads
Escaped from the Slab
Completed tutorial path on any difficulty
Story progression in Act 3 Chapter 4 (on any difficulty)
Story progression in Act 3 Chapter 5 (on any difficulty)
Story progression in Act 3 Chapter 6 (on any difficulty)
Story progression in Act 4 Chapter 1 (on any difficulty)
Story progression in Act 4 Chapter 2 (on any difficulty)
Story progression in Act 4 Chapter 6 (on any difficulty)
Story progression in Act 5 Chapter 2
Story progression in Act 5 Chapter 3 (on any difficulty)
Story progression in Act 5 Chapter 5 (on any difficulty)
Story progression in Act 5 Chapter 6 (on any difficulty)
Story progression in Act 5 Chapter 8 (on any difficulty)
Complete all acts on Casual Difficulty
Complete all acts on Normal Difficulty
Complete all acts on Hardcore Difficulty
Complete all acts on Insane Difficulty
Recover 22 COG tags (on any difficulty)
Recover all 33 COG tags (on any difficulty)
Kill 3 enemies at once 10 different times (on any difficulty)
Complete all acts in co-op (on any difficulty)
Kill 10,000 people in Versus matches
Defeat General RAAM in co-op on Insane without either player being DBNO