Haha, I have 4 level 99 onion knights (With maximum HP), the metal card as proof of my slaying the iron giant, and almost all onion equipment. I dare you to find something I haven't completed in this game.
And by the way, those 87 hours are to complete EVERYTHING in the game. All wifi quests, mastered characters, maximum job levels etc. Completing the main plot, i.e beating the CoD probably took about 40-ish.