Need help deciding what my next XBL purchase should be...

So I will probably end up getting both eventually but for the moment I can't decide between The Da Vinci Disappearance DLC for Assassin's Creed: Brotherhood or the XBLA release of Torchlight. Now I realize that Torchlight will probably give me a longer time with the content present, but something you have to know about me is that I love achievements. So while Torchlight will probably be longer in itself, the Assassin's Creed DLC has some pretty time consuming achievement by the looks of it. Also, I've already bought and played Torchlight on the PC, but I'm always up for more dungeon crawling and loot hording, especially when I get achievements for doing it :)
 
So Giant Bomb...what do you guys think?

If you already have Torchlight on the PC, I say go for the Assassin's Creed: Brotherhood add-on.

If you love easy achievements, get Pacman CE: DX.

If you have torchlight on the PC, you already have the definitive version.

I'm playing Shadow Complex again, get that. It's good. 

If you're looking for something other than torchlight... 
 
Shadow Complex (as mentioned) 
Super Meat Boy 
Scott Pilgrim 
Pac Man CE DX (as mentioned. Easy 200 gamerscore) 
Hydro Thunder Hurricane (THIS) 

Well if you're going to decide between the two, I'd say the AC Brotherhood DLC. Nothing wrong with more story.
Torchlight is still "just" Torchlight and there's no new story to it as far as I know?