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