Here is the full list of all 8 The Lost Heir 2: Forging a Kingdom achievements.
You have allied with all five demi-human races.
You have found a legendary mount.
You have become a demon summoner with ironclad willpower.
You have become a master in your class.
You have learned a prestige class.
You have learned of your foster parent's great regret.
You have reunited Daria.
You have saved a friend from a terrible fate.