Full list of all 43 Torchlight II achievements worth 1,000 gamerscore. It takes around 50-60 hours to unlock all of the achievements on Xbox One.
Defeat Killbot
Defeat Thiss
Defeat Boletus Rex
Defeat Bloatfang
Defeat the Grizzled Alpha
Defeat the Wraith Lord
Defeat the Siege Guardian
Defeat Ezrek Khan
Defeat Aruk
Fish using dynamite
Defeat the Artificer
Defeat the Manticore's Mate
Defeat the Manticore
Defeat Grand Regent Eldrayn
Defeat Kidrik the Mauler
Defeat Chillhoof
Defeat King Pogg
Defeat the Winter Widow
Defeat General Grell
Send your pet to town
Find a secret room
Defeat the Fallen Guardian
Defeat One-Eyed Willy
Defeat Mordrox
Defeat the King in Masks
Defeat Cacklespit
Defeat Vyrax
Defeat Marishka
Defeat Aleera
Defeat Verona
Defeat the Dark Alchemist
Defeat the Nether King
Assemble TrillBot
Use a map
Have 1,000,000 gold
Do 10,000 damage with a single attack
Wear a completed armor set
Find a legendary item
Reach level 100
Begin a new game plus
Start a hardcore character
Die with a hardcore character
Defeat the Nether King in hardcore mode