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