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