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