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