Here is the full list of all 30 Avadon 3: The Warborn achievements.
Open a secret door.
Complete the tutorial.
Report Geert's fate, good or bad.
Drive Dheless out of Khemeria.
Find a route to peace with the Wyldrylm rebels.
Find the irritant that is expanding The Corruption. Remove it.
Recover from Avadon everything that you need.
Deal with the brutal stalemate in The Kva.
Establish your dominance over the Warborn.
Recover the great traitor's invitation.
Steal the invitation from the servant of a living god.
Infiltrate. Learn. Escape.
Complete Avadon on any difficulty.
Complete Avadon on Hard difficulty or higher.
Complete Avadon on Torment difficulty.
Restore Redbeard to his rightful place. (Normal difficulty or higher.)
Take the throne. (Normal difficulty or higher.)
Augment 20 items.
Have Nicodemus craft six items for you.
Complete the entire game without ever using a Resurrection scroll. (Normal difficulty or higher.)
Read 30 codexes.
Cement your alliance with the ogres.
On the Corruption border, fight all six Farlanders at once.
Put on your own magical disguise.
Free the Eternal Prisoner.
Bring peace to the Beraza Woods with minimal bloodshed.
Bring Avadon knowledge of three libraries.
Win a Hand's loyalty.
Kill a dragon. (Hard difficulty or higher.)
Kill a god. Not an old, feeble god. One of the tough ones. (Torment difficulty.)