Complete the following achievements to unlock Microsoft Gamerscore points.

Achievement	How to unlock
Burn them! (100 points)	Kill 10 000 zombies with your flamethrower.
Finders keepers (50 points)	Find 250 money pickups.
Gas is cheap (25 points)	Burn 1000 zombies in Slaughter mode.
Homeless zombies (35 points)	Destroy 50 spawners in Story Mode.
It was in self defence. I swear (30 points)	Kill 10000 zombies in Slaughter mode.
My car is my weapon (35 points)	Kill 25 enemies by ramming them with your car in the Blood Race mode.
Shoot them! (100 points)	Kill 10 000 zombies with your minigun.
Unstoppable (75 points)	Earn 200 000 points on any arena in Slaughter mode.
Zombie Superstar (50 points)	Make a 30 000 points combo.