Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock
Armament King ( 10 points )	Kill your enemies in "Jimmy's Vendetta" with every weapon available in the game.
Carnapper ( 50 points )	Finish all Car Dealer missions in "Jimmy's Vendetta."
Explorer ( 10 points )	Drive a total of 1,000 miles in vehicles in "Jimmy's Vendetta."
Faster than Light ( 10 points )	Achieve a 10x point multiplier in "Jimmy's Vendetta."
Firebug ( 10 points )	Destroy 100 vehicles in "Jimmy's Vendetta."
First Step ( 10 points )	Complete your first mission in "Jimmy's Vendetta."
Massacre ( 20 points )	Kill 1,000 enemies in "Jimmy's Vendetta.
Millionaire ( 20 points )	Earn 1,000,000 points in "Jimmy's Vendetta."
Revenged ( 100 points )	Finish "Jimmy's Vendetta" on any difficulty level.
Sharpshooter ( 10 points )	Kill 100 enemies by headshots in "Jimmy's Vendetta."