Here is the full list of all 13 Shadows: Heretic Kingdoms achievements.
Reach level 10.
Defeat the Scorpion King.
Acquire the Reaper sword.
Successfully escape Thole.
Max out one of your skills with any puppet.
Defeat the Aphotic Spider Queen and her minions.
Earn second level
Unlock the Ishkai Sniper soul.
Avoid fighting the Werewolf Berserkers.
Complete Book One.
Reach level 20.
Reach level 30.
Have Zaar fulfill his most fervent desire.