Full list of all 12 Torchlight achievements worth 200 gamerscore. It takes around 10-12 hours to unlock all of the achievements on Xbox 360.
Achieve maximum fame
Defeat Alric
Defeat Medea
Defeat Krag
Defeat the Ember Colossus
Defeat the Root Golem
Successfully enchant one item 10 times
Defeat the Overseer
Successfully enchant one item 5 times
Defeat Brink
Send your pet to town
Change your pet by feeding it fish