All the Face Camos
Laughing Beauty - In Act 2, when you face Laughing Octopus, you can either kill her or take her out using non-lethal attacks. Don't kill her to receive this mask.
Raiden A, Raiden B, Otacon - During the mission briefing in Act 3, at a certain point you can take manual control of the Mk. II. Move the Mk. II around manually and ram it into three characters to unlock three face camos: Otacon ("Otocan face camo"), Naomi (Cyborg Raiden Visor Close face camo), Sunny (Cyborg Raiden Visor Open face camo)
Raging Beauty - In Act 3, defeat Raging Beauty using non-lethal attacks to the receive this face camo.
Crying Beauty - In Act 4, defeat Crying Beauty using non-lethal attacks to receive this face camo.
Screaming Beauty- In Act 5, defeat Screaming Beauty using non-lethal attacks to receive this face camo.
FaceCamo - In South America, defeat Laughing Octopus. This mask completes the Octocamo camo suit.
Young Snake - Start the Eastern Europe level.
Young Snake with Bandanna - Start the Eastern Europe level.
MGS1 - Start the Shadow Moses level
Campbell - During the mission briefing in Act 1, ram Campbell with the Mk. II.
Drebin - Acquire over 60 weapons
Big Boss - This mask looks like the decaying face of Big Boss, a recurring character in the Metal Gear Solid series. It strikes fear into enemies who see it and may cause them to run away