There's already a thread with the same topic, you should check it:

http://thefinalfantasy.net/forums/ge...ly-beaten.html

I'll post anyways since I've beaten two new Final Fantasy games just recently. Let's see:

Final Fantasy I
Final Fantasy II
Final Fantasy III
Final Fantasy IV
Final Fantasy V
Final Fantasy VI
Final Fantasy VII
Final Fantasy VIII
Final Fantasy IX
Final Fantasy Crisis Core

Apparently I'm near the end of Final Fantasy Tactics Advance but this game is so boring and annoying that I don't have a will to finish it.