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