Lego Star Wars 1, 2, and then I did it all over again on the Complete Saga
Super Smash Bros.
Uncharted: Drakes Fortune
Ratchet and Clank: Tools of Destruction (So easy I shouldn't even count it)
Metal Gear Solid 4 (Including EVERY badge, I was addicted)
Battlefront 2 (Shouldn't count this either, because I may or may not have used a trainer at some point during the course of the game)
Portal (Well.. not all of the achievements...)
Some Kirby game I downloaded for a Snes emulator, I forget what it was called...
Actually, most of the games that are on here (and that I forgot to mention) had no gameplay past the initial play through. The only time consuming ones were MGS4, Lego Star Wars, Uncharted with it's myriad of trophies, and... yeah that's it.