Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock
Assault Rifle Mastery (25 points)	Kill hundred enemies with an Assault Rifle.
Completionist (100 points)	Get all achievements.
Decked Out (50 points)	Find all armour shrines.
Finisher (25 points)	Kill hundred enemies with the quick melee.
Launcher Mastery (25 points)	Kill hundred enemies with a Launcher.
Lore Master (50 points)	Find all Lore Items.
Lost Memories (25 points)	Finish the Lost Memories questline.
Master Gunsmith (25 points)	Upgrade a weapon to the highest level.
New Gear (25 points)	Find an armour shrine.
Pistol Mastery (25 points)	Kill hundred enemies with a Pistol.
Puzzle Solver (25 points)	Decypher an item.
Rogue (25 points)	Kill hundred enemies while attacking them in the back.
Shotgun Mastery (25 points)	Kill hundred enemies with a Shotgun.
SMG Mastery (25 points)	Kill hundred enemies with a SMG.
Sniper Mastery (25 points)	Kill hundred enemies with a Sniper Rifle.
The Lost Hunter Found (25 points)	Finish The Lost Hunter Found questline.
The Pilgrim's Pilgrimage (25 points)	Finish The Pilgrim's Pilgrimage questline.
Walking Arsenal (25 points)	Equip an fully upgraded weapon in each weapon slot.
Weapon Smith (25 points)	Upgrade one of your weapons.