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