Missable Achievement.
Earned art the very end of the game and depends on your final choices.
After dealing with the two meres and resolving conflict with the Spectre.
MAKE A HARD SAVE
*** Spoiler - click to reveal ***Go through the door to see The Sorrow, exhaust the dialogue options. Now select "I am ready to make my final choice.
Now Choose" I reject your authority "
Now select a reason why you are doing this from the list.
Confirm your decision and The Sorrow will be destroyed. You must also survive the explosion.
During the end credits when you find out how the characters ended up, Matkinas story should say that she founded a village with other castoffs. Thus turning back from her isolation. The achievement will then unlock