Get Stealth & Bandanna:
Finish the tanker missions 3 different times using 3 different difficulty settings on the same save file 

Get Stealth & Wig:
Finish the plant missions 3 different times using 3 different difficulty settings on the same save file 

Get Ninja Raiden:
Finish 50% of the VR Missions as Raiden 

Get Pliskin:
Finish 50% of the VR Missions as Snake 

Get Raiden X:
Finish 100% of the VR Missions as Raiden 

Get Tuxedo Snake:
Finish 100% of the VR Missions as Pliskin 

Get Casting Theatre Option:
Finish Plant and Tanker mission using any difficulty setting 

Get MGS1 Snake:
Finish 100% of VR missions using Tuxedo Snake 

Get Boss Survival Mode:
Finish Sons of Liberty using any difficulty setting 

Get Sunglasses for Snake & Raiden:
Finish the game two times 

Get Digital Camera for Tanker-Plant:
Beat the Tanker-Plant game on any difficulty and start a new game. The digital camera is located in Strut E Shell 1. Go to the bottom of the screen and locate the platform with three red lights on it. Climb up onto it and equip the Z.O.E. Box. When the conveyor stops, press Action to climb on. You will be taken to another room. Press Action again to get off and retrieve the Digital Camera. Exit the room in the same fashion.