Here is the full list of all 31 Heroes of Loot 2 achievements.
Enter the Forest
Use the Thunder claw weapon
Collect all shard of a magic spell
Reach dungeon 30
Level up the Elf to level 5
Level up the Warrior to level 5
Use the Fire fist weapon
Find a coin room
Level up the Wizard to level 5
Use an Afterlife rune
Level up the Valkyrie to level 5
Defeat a Minotaur
Use the Soul sword
Enter a sewer level
Enter the snow area
Complete your first Bestiary info
Reach dungeon 10
Survive an Arena room
Become level 10 player
Become level 20 player
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
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