I'll play XIII-2 for this month. As good timing would have it, I started a new playthrough in December and haven't gotten past the first area as of yet, so I'm ready to go

I'll do the following for sure. I'll update if I attempt any of the other ones.
Those Hands of Time puzzles are hard!

dancechoco_yellow.gif Challenges
Beat the Game
Defeat all Coliseum fights

dancechoco_blue.gif Challenges
Get all fragments