That one was a b*** (especially the 'Elite' Trophy and the 'Achieve Online Rank 4' one). But now there it is, my 3rd Platinum Trophy.
Now that I got it, I'm thinking of trading back my copy. I still think Killzone 2 is a great game but without vehicles and/or different gameplay elements - such as massive environment destruction, of which I'm a huge fan (like in Red Faction: Guerilla) - I don't really see any incentive to keep playing the game.
Still, a must-play game!