Complete the following achievements to unlock Microsoft Gamerscore points.

Achievement	How to unlock	Points
Caretaker III	Unlock station power 12.	100
Caretaker II	Unlock station power 6.	50
Caretaker I	Unlock station power 3.	25
Collector III	Collect 720 pickups.	100
Collector II	Collect 360 pickups.	50
Collector I	Collect 60 pickups.	25
Demolisher III	Use your special weapon attack 120 times.	100
Demolisher II	Use your special weapon attack 60 times.	50
Demolisher I	Use your special weapon attack 30 times.	25
Eternity	Beat Eternity.	150
Hu Kora	Beat Hu Kora.	100
Imperious	Beat Imperious.	50
Killer III	Kill 1000 enemies.	100
Killer II	Kill 500 enemies.	50
Killer I	Kill 100 enemies.	25