The Lost achievement in The Binding of Isaac: Rebirth

The Lost

Finish the game's final secret.

The Lost-0.1
2 guidesOffline Game ModeSingle PlayerCooperative

How to unlock the The Lost achievement

  • KxRxUxExGxExRKxRxUxExGxExR723,733
    30 Jul 2015 30 Jul 2015 04 Feb 2020
    21 2 25
    *****EDITED FOR AFTERBIRTH*****

    You must die in a sacrifice room holding the missing poster. You get the poster by defeating the lamb with isaac!


    This is achievement can be done in seeds, except for the Azazels run. It can also be done on normal, not hard. Here are some amazing seeds I used to get the achievement:

    *These must all be done without failing, no dying!* There is a trick to keep the game from regestering your death, as soon as you die PAUSE THE GAME then quit to main menu. the game will say you have not died and not count twards your deaths.

    Unlocking before the DLC:

    The Lost is unlocked via very specific deaths which must be done in order without dying erroneously between runs. The lost can be unlocked with seeded runs at any step of the process except for the final one.

    1.) Isaac must die from a Mulliboom in the basement/cellar. A very easy seed to do this is CD2H NNRN, run around hurting yourself with the spiders, there's gonna be 3 mulliboms in there. Keep in mind you have to be in Hard. Alternatively, the seed Q2V4 YZET has a 2x2 room full of mullibooms when playing on hard mode, or G8Y6 SY8J for a room beneath the spawn with 3.

    2.) Magdalene must die from one of her own bombs in the Caves/Catacombs. Alternatively, the Towers tarot card can also be used. A seed that gives you Pyro on the first floor in the Treasure Room is AQAD A76B.

    3.) Judas must die by Mom's foot or Mom's hand during the boss fight. Being killed by anything else in the fight will cause the run to fail and you will need to start over from the beginning. Do not pick up pyromaniac, because it grants you immunity to Moms Foot. The hand is still fine, but if you don't have red mom, its substantially more difficult to make sure you get killed by the hand itself. (TIP: Mom's first attack is always her foot stomp, so entering the fight with half a heart or one heart is the easiest way to ensure you die from this attack). An easy seed for you to get to Mom, which has a room with spikes to damage yourself down to one heart or less is 1337HAXR (not a really easy run..). Another good seed to use as Judas would be 8LDE 8XDX, as it allows you to get high damage within the first two floors, but take note that there is nothing in the first Cursed Room. (lot of easy rooms items are : 1st floor : Sad Onion + Cat-O-Nine Tails, 2nd Floor : Spiders Box (meh) + Rotten Meats, also from start, go left, down, down and get 1 soul heart from a poop + 2 from marked stone, 3rd Floor : Ipecac + Sacred Heart if you got Angel Room, also in the room directly down from spawn there is a magic mushroom if you bomb the mushroom to the left of the middle of the room, and from here it's a really easy run)

    4.)Azazel must die by any of Satan's attacks.[1]To be sure you are killed by satan only, die on his second phase, if this fails and you kill him by accident you can still die to his foot attack. Note that resurrecting with the Ankh, Judas' Shadow, and/or Lazarus' Rags and dying in the appropriate fashion still fails the requirements and you will have to start over. You can use the Dead Cat but you will have to lose your very last life to Satan. Don't use a seed with Azazel, because you can't unlock the Lost in seeded runs. If you used a seed you have to do everything again.

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    Showing most recent comments. View all comments.
    DizmonsterWhat actually works to unlock the lost with all the new DLC? Just the poster?
    Posted by Dizmonster on 04 Feb at 17:34
    KxRxUxExGxExRYes dizmonster that's all you have to do if you have the dlc. :)
    Posted by KxRxUxExGxExR on 04 Feb at 17:55
    JayowskiTotalFark's Judas seed worked for me, the other two have not. Below ones I just used to unlock The Lost.

    Isaac (Normal)
    Room below from the start has 1 muliboom
    JTMD EZPF


    Magdalene (Normal)
    Treasure Room has Pyro (99 Bombs)
    AQAD A76B
    Posted by Jayowski on 08 Jun at 16:15
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  • Insane FalloutInsane Fallout305,243
    29 Aug 2015 27 Jul 2015
    5 0 4
    This is a secret achievement for the hidden character "The Lost"

    The Lost is a super frail character, meaning that if it takes a single hit of damage then you lose...Ohh and there's absolutely no way to gain health

    The bright side to The Lost is that you start with flight and can take deals with the devil for free.

    There is a 4 step process in order to unlock the lost

    1.) Isaac must die to a Mulliboom in the Basement or Cellar. ...
    2.) Magdalene must die to her own bombs in the Caves or Catacombs. ...
    3.) Judas must die to Mom. (Not any enemies spawned by her)...
    4.) Azazel must die to Satan. (Not the fallen or the kamikaze leeches)

    You must do these steps consecutively and you cannot exit the game between runs

    Seeds can be used except for Azazel's run
    Showing most recent comments. View all comments.
    Fist O CthulhuYeah I picked up Lazarus' Rags while I was Azazel and it messed up the achievement..
    Posted by Fist O Cthulhu on 04 Aug 15 at 06:51
    SmudgeEFC1985Is this glitched? Ive just followed this exactly, using the seeds in the other solution, and nothing happened. Definitely got killed by Satan and Mom, and not their spawned enemies but nothing happened when I did the last step.
    Posted by SmudgeEFC1985 on 23 Oct 16 at 13:10
    Insane FalloutNot glitched, you can use seeds for Isaac, Magdalene, and Judas, if you used a seed for Azazel then it wont work.

    It also wont work if you leave the game at all between runs, or do anything else in between, you have to do all 4 back to back
    Posted by Insane Fallout on 23 Oct 16 at 20:41
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