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