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