Here is the full list of all 50 X-Men Origins: Wolverine achievements worth 1,000 gamerscore.
Defeated Weapon 11 (Deadpool)
Found 1/2 of all Dog Tags in the game
Completed the Jungle Mission
Defeated Remy LeBeau (Gambit)
Performed 25 Counter moves
Defeated Fred Dukes (The Blob)
Defeated the Sentinel Mark I
Flew through the O ring in the Sentinel Boss Battle
Killed 30 enemies using objects in the environment
Raised one Mutagen to level 3
You found the cake, yummy!
Quick Killed 1 enemy
Defeated David Nord (Agent Zero)
Fought 4 W.E.N.D.I.G.0 prototypes at the same time and defeated them at Alkali lake.
Dismembered 100 enemies
Lunged to 250 enemies
Killed 500 enemies
Killed 10 enemies by throwing them off high areas
Escapes from Weapon X
Killed 6 enemies with a single attack
Killed 1 enemy with a reflected projectile
Killed 10 enemies using objects in the environment
Lunged to a W.E.N.D.I.G.0 prototype's back
Lunged to 100 enemies
Defeated Victor Creed (Sabretooth)
Performed 1 Counter move
Killed 100 enemies
You found a mysterious hatch!
Lunged to 25 enemies
Killed 2000 enemies
Quick Killed 20 enemies
Quick Killed 3 enemies in a row
Raised One Combat Reflex to Master Level
Raised All Combat Reflexes to Master Level
Found all Dog Tags in the game
Killed 25 enemies with a reflected projectile
Performed 10 Air Grabs
Light 20 enemies on fire
Killed 25 Ghosts with their own weapon
Performed a Wolverine to Wolverine Lunge
You feel cold as you examine the skeleton and read the name "Arthas" etched into the nearby sword
Got 6 enemies airborne at once
Maxed out all upgrades
Killed 200 enemies with Claw Spin
Beat the game on Hard Difficulty
Killed 200 enemies in Feral Sense
Killed 50 enemies while in Berserker mode
Killed 150 enemies while in Berserker mode
Impaled Victor Creed outside the Bar
Destroyed all objects in the grocery store fight with Fred Dukes (The Blob)