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