Here is the full list of all 23 Absolver trophies - there are 6 bronze, 9 silver, 7 gold and 1 platinum.
Become an Absolver
Kill Risryn
Kill Cargal & Kilnor
Master 1 new Attack
Kill all marked ones with one character
Push AI off ledge
Loot 1 weapon
Kill Kuretz
Earn all trophies
Win 1 PVP Duel
Reach Game Mode Level 5
Join a school
Kill your opponent with his own weapon in 1v1
Open all Cairns with one character
Become a disciple of your school
Create a school
Have Cargal kill Kilnor (or the opposite)
Kill 100 Players Character (Any Character)
Kill all bosses in their last level with one character
Unlock all fighting styles with one character
Master all attacks with one character
Unlock Calbot
Reach Game Mode Level 100