Here is the full list of all 44 Torchlight II trophies - there are 34 bronze, 6 silver, 3 gold and 1 platinum.
Defeat the Nether King
Defeat the Dark Alchemist
Defeat Vyrax
Defeat Killbot
Defeat Thiss
Find a secret room
Defeat Bloatfang
Defeat the Grizzled Alpha
Defeat Boletus Rex
Defeat the Siege Guardian
Defeat Ezrek Khan
Defeat the King in Masks
Defeat Aruk
Defeat the Artificer
Defeat the Manticore's Mate
Defeat the Manticore
Defeat Grand Regent Eldrayn
Defeat Chillhoof
Defeat King Pogg
Defeat Kidrik the Mauler
Defeat the Winter Widow
Defeat General Grell
Send your pet to town
Defeat the Fallen Guardian
Obtain All The Trophies
Defeat One-Eyed Willy
Defeat Mordrox
Defeat the Wraith Lord
Defeat Cacklespit
Defeat Marishka
Defeat Aleera
Defeat Verona
Assemble TrillBot
Fish using dynamite
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