Just beat it on hard and you will platinum it (9 level trophies, 1 for beating on medium, one for beating on hard..which will unlock medium trophy as well. 11 Golds, 1 Plat.); takes about 5-6 hours or less if you are pretty good at these games.
Sonics Ultimate Genesis Collection
Fun to play for the old games, most games have a trophy for them. All very easy, especially if you grew up playing some of them.
Xmen Origins: Wolverine
I'm playing through this on Hard now (you have to unlock hard by beating on normal). Very easy game, but will require some level replays to get upgrades. Starting a new game will erase all stats, so get every trophy except "Beat on Hard" before you start hard, otherwise whatever trophies you didn't get will have to be started over (i.e. Get 2000 kills, find all 95 dog tags, etc).
I'm Working on Sonic now. I heard Tomb Raider is another easy one so i'm going for that 1 as well. Infamous is another easy 1. I got the platinum trophy for that 1 a few days ago.
Haven't seen this posted yet:
One I don't see on there is Pure, I found it quite easy.
Buzz is easy too, but very time consuming (unless you use the trophy glitch).