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