In Episode 1, during the third quest, after you read the message that your mother has left you, you will head down some stairs outside of your room. While walking down the stairs, you will run into Elizabeth Adams. You will have some quick conversation with her (you can choose any dialogue options; they will all lead to the Confrontation), and then you will have a Confrontation. There are several paths you can take here, but this is the simplest way to succeed through the Confrontation.
During the Confrontation, simply select "To find out the truth" and then "Mention her sister."
Achievement unlocked! 💚