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