Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock
A Laugh a Minute ( 20 points )	Complete Mission 4 on Hard.
Army Issue ( 15 points )	Kill 5 enemies with one M16 clip.
Blue Leg ( 50 points )	Complete the game on Easy.
BOHICA ( 20 points )	Complete Mission 5 on Hard.
Bok-Bok ( 15 points )	Beat down an enemy.
Bookoo Hostiles ( 20 points )	Complete Mission 10 on Hard.
Boom Baby! ( 15 points )	Kill 3 enemies with one rocket or grenade.
Bush Master ( 20 points )	Complete Mission 7 on Hard.
Caca Dau ( 15 points )	Score a decapitating head shot.
Caca Dau x 15 ( 15 points )	Score 15 decapitating head shots.
Can't Quit You ( 15 points )	Complete the game twice.
Captured ( 10 points )	Complete Mission 7 on Normal.
Charlie Don't Surf ( 150 points )	Complete the game on Normal.
Cook-Off ( 15 points )	Kill 15 enemies with one belt of a non-mounted Heavy Machine Gun.
Cut a Chogie ( 20 points )	Complete Mission 6 on Hard.
Cutting a path ( 15 points )	Kill 15 enemies with the machete.
Deep Serious ( 20 points )	Complete Mission 2 on Hard.
Dinky Dau ( 20 points )	Complete Mission 3 on Hard.
Evac ( 10 points )	Complete Mission 9 on Normal.
Field of Fire ( 15 points )	Kill 5 enemies with one AK47 clip.
Fire for Effect ( 15 points )	Find and pick up every weapon.
Free Fire Zone ( 15 points )	Kill 150 enemies.
FUBAR ( 20 points )	Complete Mission 1 on Hard.
Gun Slinger ( 15 points )	Complete a level firing only a pistol.
Hard Boiled ( 15 points )	Kill 3 enemies with one pistol clip.
Host ( 10 points )	Complete Mission 1 on Normal.
Hunted ( 10 points )	Complete Mission 6 on Normal.
Infection ( 10 points )	Complete Mission 3 on Normal.
Lots of Bok-Bok ( 15 points )	Beat down 15 enemies.
Natural Resistance ( 35 points )	Complete the game without being killed by an Infected.
Payback ( 10 points )	Complete Mission 8 on Normal.
Quarantine ( 10 points )	Complete Mission 2 on Normal.
Refuge ( 10 points )	Complete Mission 4 on Normal.
Shell Shocked ( 200 points )	Complete the game on Hard.
SNAFU ( 15 points )	Dismember 50 enemies.
Snoop 'n' Poop ( 20 points )	Complete Mission 8 on Hard.
Take it Like a Man ( 40 points )	Complete a level without dying.
Trip ( 10 points )	Complete Mission 5 on Normal.
Whiteknight ( 10 points )	Complete Mission 10 on Normal.
Zone and Sweep ( 20 points )	Complete Mission 9 on Hard.