5907f556_ecrets_for_Xbox_360___GameFAQs__How_to_Unlock
[Unlockable] Stealth Camouflage [How to Unlock] 
Find and shoot all 64 Kerotan frogs that are scatter through out the whole game.
Metal Gear Solid HD Collection Cheats, Codes, and Secrets for Xbox 360 - GameFAQs