Alternate Sound FX - At the main menu, using the D-pad, press up/up/down/down/left/right/left/right/B/A. A meow will confirm the code was entered correctly.

Bravery (15) - Use only your knife to beat the Harbor Level.

Fair Fight (10) - Reach the mortar without defeating any unarmed soldier in Missile Base.

Good Start (10) - Complete the Missile Base.

Knife Master (20) - Complete all levels using only your knife and no powerups.

Mad Marine (30) - Rescue the POWs twice.

Not Bad (10) - Get a score of 50,000 or more.

Reflexes (15) - Complete the Missile Base without dying.

Stamina (15) - Complete the Bridge Level.
Stealth (15) - Complete Missile Base, deafting less than 18 enemies.

Teamwork (20) - Score 200,000 or more playing an Xbox Live co-op match.
True Marine (20) - Rescue the POWs in less than 10 minutes.

Victory (20) - Beat the Enemy Prison Camp.