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