Here is the full list of all 12 RAW Realms of Ancient War achievements.
Possess 15 mobs
Hit an enemy for 2500 HP damage
Find 5 statues of Kilthi
Finish the game with all heroes
Start a cooperative game
Raise all of your skills to level 1
Complete the game with any hero
Complete 50 quests
Collect 50,000 gold coins
Complete a level without dying
Kill 1000 mobs in the campaign
Equip epic or legendary armor