Here is the full list of all 66 Torchlight achievements. It takes around 100-120 hours to unlock all of the achievements on Windows.
Sell 10,000 items to vendors
Catch 1000 fish
Catch 100 fish
Kill 25 champion trolls
Kill 50,000 monsters
Complete 50 Hatch Quests
Die 500 times
Beat the game with all three classes
Defeat Ordrak in 8 hours or less
Defeat Ordrak in less than 5 hours
Catch 50 fish
Reach level 100
Reach the 50th floor of a dungeon
Suffer 20 disenchants from the enchanter
Drink 5,000 potions
Achieve maximum fame
Complete 200 Quests
Complete 25 Gar Quests
Defeat Ordrak on Hard Hardcore
Defeat Ordrak with no deaths
Defeat Ordrak on Normal Hardcore
Defeat Ordrak on Easy Hardcore
Defeat Ordrak on Hard
Defeat Ordrak on Very Hard
Defeat Ordrak on Very Hard Hardcore
Smash 1500 Breakables
Successfully enchant one item 10 times
Gamble 100 times
Gamble 50 times
Use 50 potions on your pet
Retire over 300 levels worth of characters
Gamble 20 times
Gamble a unique item
Retire two characters
Retire a character
Defeat Ordrak on Easy or Normal
Defeat Alric
Successfully create 25 items using the transmuter
Defeat Medea
Defeat Krag
Transform your pet into a Mimic
Have an item disenchanted on the first enchantment attempt
Successfully enchant one item 5 times
Achieved enlightenment by speaking with the horse 100 times
10 mods used at the same time
Do at least 10,000 damage to an enemy in a single strike
Achieve player level 100
5 mods installed at the same time
Kill 5000 Monsters
Defeat the Ember Colossus
Equip a spell on your pet
Take 25,000 steps
1 game mod installed
Defeat the Overseer
Send your pet to town
Defeat Brink
Find the entrance to the mine
Fill your pet's inventory
Collect 250,000 gold
Have 100,000 gold in your inventory
Blow 25 enemies to pieces with critical strikes
Change your pet by feeding it fish
Permanently transform your pet
Achieve player level 65
Pull 100 levers
Defeat the Root Golem