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