Spend 50 coins
Squash 25 bugs
Finish the level in under 3 minutes
Complete the game
Complete eight levels
Complete the game with "No margin for error" or "Curse" mutator
Kill the Ancient Necromancer
Complete five levels
Complete the game with "Fog" or "Broken cartridge" mutator
Die after drinking the poison
Kill the Elder Flower
Complete the first level
Start the game with any mutator
Put the items in all the inventory slots
Buy all the mutators