Achieve final plus in Arcade Mode
Other than Route F, H, & I in Arcade Mode, complete the game with at least 5 DESTINY Ranks (a.k.a. FAITH Badges) without continue.
Unlock movies
Most of the movies can be unlocked by playing through PLUS mode, however the last few requires you to befriend with specific characters:
Effect - Code
Movie 20 - Max friendship with Kira and Athrun (Plus mode)
Movie 21 - Max friendship with Athrun, Rei, Heine, Lunamaria (Plus mode)
Movie 22 - Max friendship with Kira and Lacus (Plus mode)
Movie 23 - Max friendship with Athrun and Cagalli (Plus mode)
Movie 24 - Max friendship with Stellar (Plus mode)
Movie 25 - Max friendship with Stellar, Auel, Sting (Plus mode)
Movie 26 - Max friendship with Heine and Miguel (Plus mode)
Movie 27 - Max friendship with the 3 DOM Trooper Pilots (Plus mode)
Movie 28 - Max friendship with the 3 M1 Astray Pilots (Plus mode)
Unlockable Characters
Below a list of some unlockable characters in this game:
Effect - Code
Black Assh - Successfully complete Arcade Mode eight times.
Dearka's Zaku - Successfully complete Arcade Mode six times.
G Route - Successfully complete Arcade Mode once.
Gaia Gundam: Andrew Waltfeld Custom - Beat Arcade Mode nine times.
Gells-Ghe - Successfully complete Arcade Mode four times.
H Route - Successfully complete Arcade Mode twice.
Heine's Zaku - Successfully complete Arcade Mode three times.
I Route - Successfully complete Arcade Mode eleven times.
Stargazer - Successfully complete Arcade Mode ten times.
Yzak's Gouf - Successfully complete Arcade Mode five times.
Zamza-Zah - Successfully complete Arcade Mode seven times.