Here is the full list of all 119 Torchlight II achievements. It takes around 200 hours to unlock all of the achievements on Windows.
Have 10,000,000 gold
Sell 50,000 items
Use 100 maps
Use 5,000 potions
Deal 100,000 critical strikes
Find 100 secret rooms
Break 10,000 breakables
Use an enchanter 500 times
Destroy 100 socketed gems
Socket 500 gems into items
Recover 100 gems from items
Fish 1,000 times
Sell 5,000 items
Find a legendary item
Have 50 friends
Defeat the Nether King with each of the 4 classes
Defeat the Nether King as a Berserker
Reach level 100
Obtain a tier 3 skill bonus
Use 10 maps
Purchase 100 items from the gambler
Have 1,000,000 gold
Defeat the Nether King as an Outlander
Defeat 500 champions
Defeat the Nether King in Elite difficulty
Defeat the Nether King in Veteran difficulty
Defeat the Nether King as an Engineer
Defeat the Nether King in hardcore mode (casual)
Defeat the Nether King in hardcore mode (elite)
Defeat the Nether King in hardcore mode (normal)
Defeat the Nether King in hardcore mode (veteran)
Purchase 50 items from the gambler
Squish 1000 critters
Deal 10,000 critical strikes
Explode 10,000 enemies
Use 500 potions
Begin new game plus
Use a map
Defeat the Nether King in Casual difficulty
Defeat the Nether King in Normal difficulty
Defeat the Nether King as an Embermage
Defeat the Nether King
Defeat the Dark Alchemist
Defeat Verona
Defeat Marishka
Defeat Aleera
Defeat Vyrax
Assemble TrillBot
Defeat Killbot
Do 10,000 damage with a single attack
Defeat Cacklespit
Defeat Thiss
Find 10 secret rooms
Defeat Bloatfang
Defeat the Wraith Lord
Defeat the Grizzled Alpha
Take 100,000 steps
Obtain a tier 2 skill bonus
Purchase 20 items from the gambler
Destroy 10 socketed gems
Have 100,000 gold
Squish 500 critters
Defeat the King In Masks
Fish 100 times
Socket 50 gems into items
Use an enchanter 50 times
Wear a completed armor set
Open 500 chests
Learn 4 spells
Defeat Boletus Rex
Take 50,000 steps
Defeat 100 champions
Defeat the Siege Guardian
Defeat Ezrek Khan
Defeat Aruk
Deal 1,000 critical strikes
Break 1,000 breakables
Teach a pet 4 spells
Teach a pet a spell
Start a multiplayer game
Sell 500 items
Defeat the Artificer
Squish 100 critters
Use 50 potions
Defeat the Manticore's Mate
Defeat the Manticore
Recover 10 gems from items
Trade an item with another player
Join a multiplayer game
Die with a hardcore character
Start a hardcore character
Defeat Grand Regent Eldrayn
Defeat Kidrik the Mauler
Defeat Chillhoof
Learn a spell
Defeat King Pogg
Fish using dynamite
Explode 1,000 enemies
Take 10,000 steps
Open 100 chests
Use an enchanter 10 times
Defeat 25 champions
Defeat the Winter Widow
Destroy a socketed gem
Recover a gem from an item
Defeat General Grell
Find a secret room
Defeat Mordrox
Obtain a tier 1 skill bonus
Break 100 breakables
Defeat One-Eyed Willy
Fish 10 times
Defeat the Fallen Guardian
Open 20 chests
Explode 100 enemies
Send your pet to town
Socket a gem into an item
Add a friend
Have 10 friends