To do this, you need to have leveled up enough to unlock the trait "Good Catholic" or "Puritan", found in the skill menu of your character below the weapon Proficiency.
Take note that "Good Catholic" requires additional skills to be unlocked, included are:
- Level 9+
- Renown 200+
- No "Blasphemer" trait
- No "Puritan" trait
Choosing Puritan is simpler trait if you do not have the required renown to unlock "Good Catholic"
Head to any Procurer at a tavern and confront him of his blasphemous practice of prostitution, unlocking this achiechement