Complete the following achievements to unlock Microsoft Gamerscore points.

Achievement	How to unlock	Points
Amateur Armourer	Unlock your third gun.	50
Armoury III	Buy nine upgrades.	100
Armoury II	Buy six upgrades.	60
Armoury I	Buy three upgrades.	20
Bullet Magnet	Take a total of 1,000 damage.	60
Completionist III	Complete level 3.	50
Completionist II	Complete level 2.	50
Completionist IV	Complete level 4.	50
Completionist I	Complete level 1.	50
Completionist V	Complete level 5.	50
Killer III	Kill 1,000 enemies.	100
Killer II	Kill 500 enemies.	60
Killer I	Kill 250 enemies.	20
Starter Gunner	Fire offensive weapons a total of 5,000 times.	50
The Gallerist III	Unlock twelve gallery entries.	100
The Gallerist II	Unlock six gallery entries.	60
The Gallerist I	Unlock three gallery entries.	20
Time Trial	Score 25,000 points or more in one Trial Mission.	50