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