Achievements
     Complete each achievement to get the allotted gamerscore:

A Laugh a Minute (20):   Complete Mission 4 on Hard

Army Issue (15):         Kill 5 enemies with one M16 clip

Blue Leg (50):           Complete the game on Easy

BOHICA (20):             Complete Mission 5 on Hard

Bok-Bok (15):            Beat down an enemy

Bookoo Hostiles (20):    Complete Mission 10 on Hard

Boom Baby! (15):         Kill 3 enemies with one rocket or grenade

Bush Master (20):        Complete Mission 7 on Hard

Caca Dau (15):           Score a decapitating head shot

Caca Dau x 15 (15):      Score 15 decapitating head shots

Can't Quit You (15):     Complete the game twice

Captured (10):           Complete Mission 7 on Normal

Charlie 
Don't Surf (150):        Complete the game on Normal

Cook-Off (15):           Kill 15 enemies with one belt of a non-mounted 
                         Heavy Machine Gun

Cut a Chogie (20):       Complete Mission 6 on Hard

Cutting a path (15):     Kill 15 enemies with the machete

Deep Serious (20):       Complete Mission 2 on Hard

Dinky Dau (20):          Complete Mission 3 on Hard

Evac (10):               Complete Mission 9 on Normal

Field of Fire (15):      Kill 5 enemies with one AK47 clip

Fire for Effect (15):    Find and pick up every weapon

Free Fire Zone (15):     Kill 150 enemies

FUBAR (20):              Complete Mission 1 on Hard

Gun Slinger (15):        Complete a level firing only a pistol

Hard Boiled (15):        Kill 3 enemies with one pistol clip

Host (10):               Complete Mission 1 on Normal

Hunted (10):             Complete Mission 6 on Normal

Infection (10):          Complete Mission 3 on Normal

Lots of Bok-Bok (15):    Beat down 15 enemies

Natural Resistance (35): Complete the game without being killed 
                         by an Infected

Payback (10):            Complete Mission 8 on Normal

Quarantine (10):         Complete Mission 2 on Normal

Refuge (10):             Complete Mission 4 on Normal

Shell Shocked (200):     Complete the game on Hard

SNAFU (15):              Dismember 50 enemies

Snoop 'n' Poop (20):     Complete Mission 8 on Hard

Take it Like a Man (40): Complete a level without dying

Trip (10):               Complete Mission 5 on Normal

Whiteknight (10):        Complete Mission 10 on Normal

Zone and Sweep (20):     Complete Mission 9 on Hard