Score 200,000 or more playing an Xbox Live co-op match.
Complete the Bridge Level.
Use only your knife to beat the Harbor Level.
Get a score of 50,000 or more.
Complete Missile Base, defeating less than 18 enemies.
Complete the Missile Base without dying.
Complete the Missile Base.
Reach the mortar without defeating any unarmed soldier in Missile Base.
Rescue the POWs in less than 10 minutes.
Rescue the POWs twice.
Beat the Enemy Prison Camp.
Complete all levels using only your knife and no powerups.