Unlock JJ Sawyer
Finish the game getting a S rank in all levels

Unlock Naomi
Finish the game getting a B rank in all levels

Unlock The Insider
Finish the storage level getting a B rank

How to get New Outfits
New Kat Outfit - Finish score attack mode with high scores in all levels
New Ethan outfit - Finish stunt attack mode

Get Stunt Attack Mode
Finish Story mode