Alternate sound effects:To unlock alternate sound effects, at the main menu, press Up(2), Down(2), Left, Right, Left, Right, B, AAchievements:ACHIEVEMENT – HOW TO UNLOCKBravery (15 points) – Use only your knife to beat the Harbor Level.Fair Fight (10 points) – Reach the mortar without defeating any unarmed soldier in Missile Base.Good Start (10 points) – Beat the Missile Base.Knife Master (20 points) – Beat all levels using only your knife and no powerups.Mad Marine (30 points) – Rescue the POWs twice.Not Bad (10 points) – Get a score of 50,000 or more.Reflexes (15 points) – Beat the Missile Base without dying.Stamina (15 points) – Beat the Bridge Level.Stealth (15 points) – Beat Missile Base, deafting less than 18 enemies.Teamwork (20 points) – Score 200,000 or more playing an Xbox Live co-op match.True Marine (20 points) – Rescue the POWs in less than 10 minutes.Victory (20 points) – Beat the Enemy Prison Camp.