The Binding of Isaac: Rebirth

The Binding of Isaac: Rebirth

79 Achievements

1,520

680-1000h

Xbox One
Xbox Series
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Mom's Knife

Mom's Knife

Kill Satan with Isaac.

15

14.82%

How to unlock the Mom's Knife achievement in The Binding of Isaac: Rebirth - Definitive Guide

Well first things first you have to play as Isaac.

To get to Satan, you must kill moms heart; and If you killed moms' heart enough times or a devil room shows up, you go down into Sheol. Once you get to Sheol it's like all other floors just find your way to the boss room. When you get to the boss room, you will be fighting a 3 phase boss fight, You start by Fighting the Fallen, then you fight Satan, then you fight Satan's feet. After you kill the final phase just walk up to the chest and you get your Achievement.

As far as tips go... I can't give much, but if you've made it to Sheol, and have enough a good amount of hearts you should be fine. I beat Satan on my first try, Was it luck, mostly, but this game has a lot of RNG, So I hope you get as lucky as I did
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24 Jul 2015 08:28

1 Comment
That video is fucking insane! Love it! The hat a great game clap
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By C64 Mat on 09 Mar 2016 11:15
Defeat Satan as Isaac
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14 Jul 2023 00:00

In order to guarantee access to Sheol, you have to beat Mom's Heart 11 times or get there from other means like using We Need To Go Deeper in The Womb II. See "Judas" for a detailed explanation on how the fight with Satan will play out.

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