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