Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock
Celebrated ( 25 points )	Collect all the medals.
Chain Gang ( 15 points )	Kill 2 Malthusians within a timed chain attack.
Challenged ( 15 points )	Complete the Challenge Room.
Davy Jones' Locker ( 15 points )	Neutralize 10 Malthusians in underwater combat.
Drowned ( 10 points )	Drown a Malthusian.
Honour ( 15 points )	Collect 50% of the medals.
My Hero ( 10 points )	Save Chief Billingham.
Private Eye ( 35 points )	Collect all documents and objects.
Survivor ( 25 points )	Complete the game.
Swept Off Their Feet ( 15 points )	Sweep 3 Malthusians off their feet with water.
Tinker ( 10 points )	Complete a hack.
Vengeance ( 10 points )	Kill 5 Mathusians with fire or electricity.