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