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