Here is the full list of all 40 Archvale achievements.
Defeat the Old King.
Reconstruct the gateway to Archvale.
Craft 30 items.
Obtain Avarn's Sword.
Collect all healing flasks.
Collect all Heart Containers.
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.
Cash in 10 treasures.
Defeat the Grove's Blight.
Defeat the Sunken Queen.
Assemble the Arch Lexicon.
Complete every trial.
Obtain the best potion recipe.
Survive the ritual of the Molten Rift.
Perform five consecutive dashes without stamina recharging.
Fully upgrade a weapon.
Destroy the barrier guarding Tanglegrove.
Defeat the Rotted King.
Defeat the Exiled Wizard.
Complete half of your badge collection.
Defeat the Soul Serpent.
Defeat Frankenslime.
Defeat the Fallen Pharaoh.
Defeat 1000 enemies.
Own 8 hearts.
Defeat the Queen Duneworm.
Enter the Twisted Caverns.
Defeat the Ghost Crab.
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.