Beat the game on Easy or Normal.
Beat the game on Easy or Normal to unlock the Blackbird suit. You cannot change moves or upgrade.
Beat the game twice using the same saved game file. You can assign what super moves you want Vanessa to have at each portal and in between missions.
Beat the game on Normal to get an different ending from Easy.
Beat the game on Hard and get at least a "Regular" rank overall.
Thanks to Revolution readers Puffy and Maximus44!