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