insomniac17 on 04 January 2010
I know that one's a bit vague, yes. 
I'll pretend like you aren't joking and answer anyway. To get the Platinum Trophy for this game, you must first collect each of the other trophies. Once you've done that, it will unlock automatically. For help on the rest of the trophies, please see the other parts of my guide.
Hope that was helpful!
