GTA IV will now have Trophy Support available for download off of the PlayStation Network.  In total there are 51 trophies, most of which will be exactly the same as the Xbox 360 Achievments in GTA IV.

Trophies will not be retroactive, which means you will have to restart a new score to earn these trophies.  Those of you who don't currently own the game, but plan on owning it in the future, this will not effect you.