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