I have Just Cause 2's platinum, although I pretty much stopped at 75% completion Though given Just Cause 2's size I think that's fair enough
Other stuff include
GTA 4
GTA 5
Red Dead Redemption
Assassin's Creed Brotherhood
Coconut Dodge (Hey, it's a cheap minigame, but it's frustratingly hard, so I wear it with pride)
Mass Effect
Prince of Persia Trilogy
Sly Cooper Trilogy
God of War Trilogy
Sleeping Dogs