Well, I've downloaded some other guy's save at GameFAQs, and he has almost everything unlocked. I say almost because of the stages. He has Phantom City and Babylon in Slash style.
By the way, for those of which said save doesn't work, the save doesn't have a Root/ID so you have to put it in yourself with PS2 Save Builder. The Root/ID is: BISLPM-66746GGXXA
Imma let the game open for a couple o' hours so I can see the results.