Here is the full list of all 40 Archvale achievements worth 1,000 gamerscore. It takes around 8-10 hours to unlock all of the achievements on Xbox One.
Defeat the Old King.
Rebuild the gateway to Archvale.
Obtain Avarn's Sword.
Collect all Heart Containers.
Collect all healing flasks.
Defeat the Banished Executioner.
Complete the Arena Challenge.
Craft 30 items.
Assemble the Arch Lexicon.
Collect every badge.
Store over 10000 gold in the bank.
Complete every trial.
Survive the ritual of the Molten Rift.
Defeat the Sunken Queen.
Obtain the best potion recipe.
Cash in 10 treasures.
Equip a shark cap and mermaid tail.
Defeat Groveblight.
Complete half of your badge collection.
Destroy the vine barrier blocking Tanglegrove.
Defeat the Rotted King.
Defeat Frankenslime.
Defeat the Exiled Wizard.
Defeat the Soul Serpent.
Fully upgrade a weapon.
Own 8 hearts.
Defeat the Queen Duneworm.
Defeat the Fallen Pharaoh.
Defeat 1000 enemies.
Enter the Twisted Caverns.
Defeat the Ghost Crab.
Repair 10 fountains.
Defeat Mongo.
Obtain an improved healing recipe.
Die.
Defeat the Great Slime.
Defeat Maxilla.
Perform five consecutive dashes without stamina recharging.
Complete your first trial.
Find the village of Timberwell.