Amuro Ray:
     Successfully  complete  the  EFF  campaign  under  the  Very Hard
difficulty then load the cleared saved game.

Char Aznable:
     Successfully  complete  the  Zeon  campaign  under  the Very Hard
difficulty then load the cleared saved game.

Fraw Bow:
     Successfully  complete  a campaign under the Very Hard difficulty
then load the cleared saved game.

Gundam:
     Reach the "Warrant General" rank.

Kai Shiden:
     Successfully  complete  a campaign under the Very Hard difficulty
then load the cleared saved game.

Kampfer:
     Reach the "Lt. Colonel" rank in the Zeon campaign.

RX-78-2 Gundam:
     Reach the Colonel in the Federation campaign.