Underground Undercover achievement in Fallout 4

Underground Undercover

Complete "Underground Undercover"

Underground Undercover0
3 guidesOffline Game Mode - These achievements require play in game modes that do not necessitate a connection to any online services.Single Player - These achievements can be obtained by a single player.Missable - These achievements can be missed.

How to unlock the Underground Undercover achievement

  • VvWhiteFangvVVvWhiteFangvV183,346
    20 Nov 2015 12 Nov 2015 13 Dec 2015
    101 47 31
    So this quest is completed for joining the Railroad Faction . It's the 3rd quest in their quest line.
    1. Road to Freedom
    2. Tradecraft
    3. Underground Undercover

    *** Spoiler - click to reveal ***

    Guide not helping? View 2 more guides for this achievement.

    Showing most recent comments. View all comments.
    IllustriousYetiOperation Ticonderoga is optional i'm pretty sure.
    OP you shouldn't be spreading false facts, players do not have to side with the RR when building the teleporter.
    Posted by IllustriousYeti on 21 Jan 16 at 12:37
    OdorlessCobraDoes anyone have any workarounds for the Desdemona glitch. The latest patch was supposed to fix this but I am still unable to complete the quest due to the glitch. Ive tried reloading, going to older saves etc.. but nothing is working, because of this glitch I am unable to 100% the game at present time.
    Posted by OdorlessCobra on 10 Feb 16 at 17:10
    BrunoWidorskiIf you accidently start building the device for the wrong faction, talk to Desdemona after you get OUT of the Institue and she'll ask you to change your affiliation!
    Posted by BrunoWidorski on 17 May 16 at 01:26
  • Have you got any tips or tricks to unlock this achievement?
    Add a guide to share them with the community.

    Sign in and add a guide
  • Firstmate FizzFirstmate Fizz412,053
    29 Dec 2015 29 Dec 2015
    20 0 2
    Underground Undercover is the 3rd story based quest for the Railroad. This achievement is missable.
    For help on joining the Railroad see the guides for the achievement Tradecraft.
    Fallout 4TradecraftThe Tradecraft achievement in Fallout 4 worth 15 pointsJoin the Railroad

    This achievement is a prerequsite for the achievement Rockets' Red Glare.
    Fallout 4Rockets' Red GlareThe Rockets' Red Glare achievement in Fallout 4 worth 70 pointsComplete "Rockets' Red Glare"

    For how this achievement can be missed please click on the spoiler below.
    *** Spoiler - click to reveal ***
    Showing both comments.
    GoH StickyI don't get it, desdemonda never gives me the quest. I completed all railroad quests and it never shows up. I stopped at institutionalized at lvl 43 and met deacon for the tradecraft quest. They then ask me to give the prototype to Carringon, to recover the dead drop and then it'a all about small quests. I ended up lvl 81 with 49 quests done for the railroad yet the quest isn't there. I'm out of options. Don't tell me how to fail this achievement but the way I can achieve it, what are the quests between tradecraft and underground undercover ? Do I have to be allied to the institute ? Should I stay with father or leave ? What do I do ?
    Posted by GoH Sticky on 13 Dec 16 at 13:45
    JdobemYou need to continue the Institute quests until after completing Powering Up. Then your quest will continue.

    More details here:
    https://fallout.fandom.com/wiki/Underground_Undercover
    Posted by Jdobem on 03 Jul 19 at 00:32
  • KalujoKalujo385,118
    05 Aug 2016 05 Aug 2016
    10 0 0
    Warn Desdemona Glitch!

    This solution is for fixing the Warn Desdemona glitch:
    After months of trying everything I could think of including a new playthrough, I figured it out.
    When you do the mission Memory Interrupted not only must you NOT LET GLORY DIE, you have to GET HER OUT OF MALVERN STATION. Near the exit to the station Glory can get caught on a turnstile & never get out. I couldn't push her away, but I kept standing up against her back until she pushed through & exited the station.
    To be on the safe side I escorted her all the way back to the hideout. She will then turn up at the appropriate times for those wanting to do the Railroad ending.
    I really hope this helps anyone else who was stuck on getting this achievement.
Do you have a question about this achievement? Please post it in the Fallout 4 Forum

Related Achievements and Trophies