[Wondermonkey]

Call of Duty 2
Oblivion
Barbie Horse Wild Adventure (glitched my way to the top though)
Jewel Quest

Also, in case you're so awesome and you don't know which games you have 100% on because you just have so many, you can use this link

http://profile.mygamercard.net/1/yourgamertag

(replace yourgamertag with uh, your gamer tag, it will be filtered by 100% completion)