Here is the full list of all 40 Archvale achievements.
Defeat the Old King.
Collect every badge.
Assemble the Arch Lexicon.
Complete every trial.
Obtain the best potion recipe.
Store over 10,000 gold in the bank.
Equip a shark cap and mermaid tail.
Collect all Heart Containers.
Reconstruct the gateway to Archvale.
Collect all healing flasks.
Defeat the Sunken Queen.
Cash in 10 treasures.
Defeat the Grove's Blight.
Craft 30 items.
Destroy the barrier guarding Tanglegrove.
Obtain Avarn's Sword.
Defeat the Banished Executioner.
Defeat the Colossal Skullbot.
Fully upgrade a weapon.
Defeat the Rotted King.
Survive the ritual of the Molten Rift.
Complete half of your badge collection.
Defeat Frankenslime.
Defeat the Exiled Wizard.
Enter the Twisted Caverns.
Defeat the Soul Serpent.
Own 8 hearts.
Defeat the Fallen Pharaoh.
Defeat 1000 enemies.
Perform five consecutive dashes without stamina recharging.
Defeat the Queen Duneworm.
Defeat the Ghost Crab.
Restore 10 fountains.
Defeat Mongo.
Die.
Obtain an improved healing recipe.
Defeat Maxilla.
Defeat the Great Slime.
Complete your first trial.
Find the village of Timberwell.