Here is the full list of all 21 Rise of the Third Power achievements.
Complete one side quest.
Obtain all relics.
Attune 5 accessories.
Obtain all weapons.
Have 5,000 gold in your inventory.
Craft every piece of gear.
Defeat 10 elite enemies.
Kill an enemy in a single attack.
Unlock every shop item.
Win a battle in the first round before any enemies can act.
Unlock all 8 team combo abilities.
Defeat all 4 Eldritch Horrors.
Craft an ultimate weapon.
Unlock 10 talents for a single character.
Purchase 3 food or drink in a single inn stay.
Reach level 30.
Equip an accessory on all 8 characters.
Sell a ruby.
Complete all side quests.
Enter Peren Desh.
Win every battle on Expert difficulty.