This will be collective, because I only know of one so far.
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Burnout Paradise 98 trophies
Burnout Paradise 98 trophies
You cannot. Others can be played but not this one. Check out this list for games that are compatable: Wikipedia Version (I personally think this one is better): http://en.wikipedia.org/wiki/List_of_Xbox_games_compatible_with_Xbox_360
When you get all the trophies that the game offers you will receive what is called a Platinum Trophy and that means you have gotten all trophies possible for a 100% total.
Just find a list of all PS3 games there are and count them. Take away the ones without trophies and the number left is the amount of platinum trophies there are.