I have to have ALL of the jobs maxed out, no matter how crap they are. I will distribute the jobs across my characters, or I will just make them all do them all D:

I have to get all the optional items that you can get by just picking them up e.g: FFIX Zodiac coins so I spent forever manically going over every square centimetre of towns I passed through without using a walkthrough |: tiring stuff.

In Skies of Arcadia, I had to have at least one of my characters learn at least one spell for every room I passed through.