Tom Clancys Ghost Recon 2 - Platform: Playstation 1

All missions:
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Press X, L2, Triangle, R2, Select at the title screen to unlock all missions.

Invincibility:
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Begin a mission, then pause game play. Press L1, R2, L2, R1, Select to become invincible.

All guns:
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At the main menu, hit x, left, triangle, square, x, select.

All special features:
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Press L1, L2, R1, R2, X, Select at the title screen to unlock all specials features.

Awards and Medals
Purple Heart: Get wounded or killed in action.
Bronze Star: Get 15 kills
Silver Star: Get 20 kills
Distinguished Service Cross: Get 25 kills
Congressional Medal Of Honor: Get 30 kills

Mission Co-operation And Firefight Co-operation modes:
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Beat the game and save. Now start with the saved file. Go to Multipalayer and you'll 
notice that there're Mission Cooperation and Firefight Cooperation modes availible in 
Multiplayer.

Note: In Ghost Recon there are two different games: Ghost Recon and Ghost Recon: 
Desert Seige(DS) (used to be sold seperately.) After you beat the Ghost Recon (15 Missions), 
there will be 8 new missions(for Desert Seige).