Buren Wanzer for the OCU story 
     Beat the OCU story for the first time.

Next New Game                      
     Beat the game once.

Sound Test
     Beat the game once.

TCK Assault Wanzer for the USN story
     Beat the USN story for the first time.

x0.5 (overrides x0.8) and x1.5 difficulties
     Beat the game twice.

x0.8 and x1.2 difficulties
     Beat the game once.

x10.0 difficulty
     Beat the game five times.

x2.0 difficulty
     Beat the game three times.

x5.0 difficulty
     Beat the game four times.