Complete the following achievements to unlock Microsoft Gamerscore points.

Achievement	How to unlock	Points
All Dead, All Dead	Kill twenty enemies in rapid succession.	20
Cool Cat	Complete all challenges in a single player mode.	100
Friends Will Be Friends	Resurrect an ally in coop mode.	20
Good Company	Complete all challenges in coop mode.	100
Keep Yourself Alive	Survive for 180 seconds.	50
Killer Queen	Kill thirty enemies with a single mega laser.	20
Machines	Kill thousand UFOs.	100
Misfire	Kill an enemy with a deflected bullet.	20
Now I'm Here	Reach 1000 points without moving.	50
Put Out the Fire	Detonate thirty bombs with a single shot.	75
Rock It	Kill thousand asteroids.	100
The Hero	Reach 2000 points in arcade mode.	50
The Hitman	Reach 4000 points in arcade mode.	75
The Invisible Man	Reach 6000 points in arcade mode.	100
The Miracle	Reach 500 points without missing a single shot.	20
We Will Rock You	Have fifty asteroids in the level at the same time.	100