Defeat all the Hard Mode Bosses: Satan, Isaac, Blue Baby, Heart, Lamb and the Boss Rush with the Lost character. Items like Dead Cat and Holy Mantle help out a lot on this tough character achievement.
This video was made early when the achievement was still getting figured out. I added Annotations to change the facts in the video.
Footage is just filler as I can not finish this achievement myself at the moment, Video is just designed to provide information on How To. Not a Walkthrough of what random items I got in order to complete it.

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