Complete the following achievements to unlock Microsoft Gamerscore points.

Achievement	How to unlock
Double Kill (100 points)	Destroy 2 enemies with a single shot 25 times.
Jump n' Shoot Man (100 points)	Jump and Shoot 5000 times.
Multi Kill (100 points)	Destroy 3 enemies with a single shot 10 times.
The floor is lava (25 points)	Don't touch the ground for 60 seconds in a single life.
Ultra Kill (100 points)	Destroy 4 enemies with a single shot 3 times.