Cunningham - Beat Cunningham on ANY difficulty by stamina kill and beat the game before January 1st 1971 in game. You get him after you make a new game.
Elisa - Get a Medic level of 80.
Gene - Recruit 200 soldiers and stamina kill Gene all in one playthrough.
Gene (EU Version) - Complete Boss Rush mode
Major Zero - Have a MGS:DGN game save on your psp's memory stick. (Second Playthrough only)
Null - Kill Null by stamina kill or HP kill when you face him twice and beat the game. You get him after you make a new game.
Para Medic - Contact her on the radio on the Comm Tower stage. She will later need to be resceud in the hospital stage. Place spies in the hospital.
Python - Kill Python by stamina kill.
Raikov - Place spies in Western Wilderness before clearing the Guard House mission. Afterwards you should get a report of a handsome prisoner being held there.
Sigint - After Snake is captured and rescued you can contact Sigint on the radio at the Comm stage. He will need to be rescued in the town.
Sokolov - Give the Saturn V blueprints to Sokolov
Teliko - Have a MGA game save on your psp's memory stick. (Second Playthrough only)
Ursula - Have a Medic level of over 80, with the second number as an odd number
Venus - Have a MGA 2 game save on your psp's mamory stick. (Second Playthrough only)
Boss Rush Mode (EU Version) - Beat the game
Extreme Difficulty - Beat the game
Stealth Camo - Beat the game with a combined Tech level of 99.
