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