Here is the full list of all 12 Arcanbreak achievements.
Got through the city without getting caught
Witnessed the Arcanbreak
Found all the lore books
Stabbed someone in the back
Killed three people with one bomb
Collected all the recipes
It all seems so... Familiar.
Listened to the speech of the Alchemist leader
Found the plans of the Alchemists
Who would do something like this?
Arun left to warn the Inquisition
Quila left to warn the Inquisition