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