
"End of the Line" requires you to find Desdemona, the leader of the Railroad, and either kill her (to continue siding with the Institute) or warn her (which halts the quest allowing you to finish "Underground Undercover").Ĥ. You receive this quest immediately finishing the Institute quest "Powering Up" which is required for the completion of "Underground Undercover". Killing Desdemona during the Institute quest "End of the Line." Speaking with Kells will make the Railroad hostile.ģ. The first stage of the quest requires you to speak with Captain Kells. Progressing too far in the Brotherhood quest "Tactical Thinking." You obtain this quest immediately after completing the Brotherhood quest "Blind Betrayal".

This includes killing members of the Railroad and also includes the specific ways listed below.Ģ. Becoming an enemy of the Railroad faction. There are a few ways for you to miss this achievement.ġ. (You can still miss this if you start killing members of the Railroad.) Until "Institutionalized" begins you can rest easy knowing you haven't missed this. In short, it doesn't matter what faction you chose to build the teleporter with in the main quest "The Molecular Level".

No quest decisions made before the main quest "Institutionalized" will make you miss this achievement. This achievement is very easy to miss as it requires you to ally with the Institute until the end of the Institute quest "Powering Up".
#UNDERGROUND UNDERCOVER HOW TO#
*** Spoiler - click to reveal *** Below is the most important information about how to unlock this achievement and how it can be missed.
