I think theres some much missed challenges what should be added in (bronze ones or why the hell did I do that? ones I guess) they are:

Achieve maximum damage with the following moves:

Thievery
Frog Drop
Dragon lance or whatever Freya's move is thats increased by killing dragons

Also:

Completing the chocobo hot and cold + chocograph quests
achieving level 99 with every character


These should really be put in the challenge I think...lazy Rantzien never thought of these :P