Here is the full list of all 19 Potions: A Curious Tale achievements.
Defeat the kraken.
Find the hidden card in the bull pen.
Brew a potion.
Unlock the broom.
Blow down the house of sticks.
Defeat the spider queen.
Reach the end of the Temple of Truth.
Reach the end of the Temple of Time.
Reach the end of the Temple of Destruction.
Reach the end of the Temple of Life.
Find every gold card.
Finish Potions: A Curious Tale.
Recruit every possible townsfolk.
Discover every potion recipe.
Discover every creature.
Discover every unique creature interaction.
Collect every card.
Pet Helios in town.
Douse Prince Charming.