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