Here is the full list of all 16 The Shrouded Isle achievements.
You have witnessed the glorious awakening of Chernobog.
You befriended House Iosefka.
In the final trial, your village forgot the virtue of Obedience.
You befriended House Blackborn.
In the final trial, your village forgot the virtue of Penitence.
You discovered every single vice and virtue in the village.
You oversaw the transformation of a perfectly pure soul.
You completely wiped out an entire House.
In the final trial, your village forgot the virtue of Discipline.
You befriended House Cadwell.
You befriended House Kegnni.
In the final trial, your village forgot the virtue of Ignorance.
In the final trial, your village forgot the virtue of Fervor.
You befriended House Efferson.
You wiped out the entire village.
You purified the village and witnessed the beginning of the next Age.