Complete the following achievements to unlock Microsoft Gamerscore points.

Achievement	How to unlock	Points
Ashes to Ashes	Destroy 300 Mines.	50
Changes	Complete the volcano.	50
Heroes	Beat a level without picking up any weapons.	50
Kooks	Destroy 200 Shooters.	25
Lazarus	Destroy 150 Drones.	50
Let's Dance	Complete the Cavern.	25
Life on Mars	Drop for ten seconds without shooting.	50
Moonage Daydream	Complete all missions.	100
Oh! You Pretty Things	Destroy 200 Chargers.	50
Quicksand	Destroy 1000 terrain pieces.	100
Rebel Rebel	Destroy 240 Twin Lasers.	50
Scary Monsters	Destroy 175 Kamikaze.	100
Space Oddity	Complete a level without losing a life.	100
Suffragette City	Complete the city environment and destroy the reactor.	100
Ziggy Stardust	Use all weapons once.	100