Here is the full list of all 20 9th Dawn II achievements.
Cast a summon spell
Kill 100 enemies
Cast a healing spell
Unlock your first spell
Get 1,000,000 Silver
Find all locations
Kill a boss with 10% HP remaining
Become over-burdened
Collect 5 Crystal Beans
Kill the Hydra Dragon
Complete the game
Unlock all spells
Kill 1000 enemies
Kill 5000 enemies
Talk to 100 NPCs
Kill a Dragon
Find plenty of treasure chests
Collect 100 items in your bank
Drink 200 potions
Let a summon kill a boss