Complete the following achievements to unlock Microsoft Gamerscore points.

Achievement	How to unlock	Points
Arsenal	Unlock a weapon.	90
Beginner	First kill a zombie.	90
Friendly man	Unlock a buddy.	90
Researcher	Discovered research evidence for the first time.	90
Robot destroyer	Kill 5 robots.	90
Robot hunter	Kill 3 robots.	90
Robot killer	First kill a robot.	90
Zombie destroyer	Kill 100 zombies.	90
Zombie eliminator	Kill 200 zombies.	100
Zombie hunter	Kill 50 zombies.	90
Zombie killer	Kill 25 zombies.	90