Here is the full list of all 31 Heroes of Loot 2 achievements.
Defeat a Minotaur
Complete your first Bestiary info
Survive an Arena room
Use the Thunder claw weapon
Level up the Elf to level 5
Level up the Warrior to level 5
Level up the Wizard to level 5
Level up the Valkyrie to level 5
Collect all shard of a magic spell
Use an Afterlife rune
Reach dungeon 10
Reach dungeon 30
Become level 10 player
Become level 20 player
Find a coin room
Enter a sewer level
Enter the Forest
Complete all quests at least once
Complete your Bestiary
Complete all magic books
Reach player status level 5
Find King Loot's lair
Defeat a Scarab Queen
Enter the snow area
Use the Fire fist weapon
Use the Soul sword
Collect all hero cards for Thief
Collect all hero cards for Mage
Collect all hero cards for Paladin
Collect all hero cards for Barbarian
Walk on fire