Azazel
ReadyMake 3 deals with the Devil in one run.
Achievement
Earn every completion mark on Hard mode as Azazel.
In-game: “Unlocked a new co-player baby.”
Sources:AchievementsCompletion Marks
Make 3 deals with the Devil in one run.
Donate 500 coins to the Greed Donation Machine.
Defeat Mom.
Reach Depths II and defeat Mom.
Sources:AchievementsWomb
Defeat Ultra Greedier as Azazel.
After: Greedier!, Azazel
Defeat Mom's Heart or It Lives! on Hard mode as Azazel.
After: Azazel, The Womb
Defeat Mom's Heart 10 times.
After: The Womb
Defeat Satan as Azazel.
After: Azazel, The Womb
Defeat Isaac as Azazel.
After: Azazel, The Womb
Complete the Boss Rush as Azazel.
After: Azazel
Defeat Satan 5 times.
After: The Womb
Defeat Isaac 5 times.
After: The Womb
Defeat Hush 3 times.
After: The Womb, Blue Womb
Defeat ??? as Azazel.
After: Azazel, The Womb, The Polaroid
Complete Chapter 6 (defeat ??? in the Chest or The Lamb in the Dark Room).
After: The Womb, The Polaroid
Defeat The Lamb as Azazel.
After: Azazel, The Womb, The Negative
Defeat Hush as Azazel.
After: Azazel, The Womb, Blue Womb
Defeat Hush.
After: The Womb, Blue Womb
Defeat Mother.
After: A Secret Exit
Defeat Mega Satan as Azazel.
After: Azazel, Angels, The Womb, The Polaroid
Defeat Delirium as Azazel.
After: Azazel, The Womb, Blue Womb, New Area
Defeat Mother as Azazel.
After: Azazel, A Secret Exit
Defeat The Beast as Azazel.
After: Azazel, The Polaroid, A Strange Door
Earn every completion mark on Hard mode as Azazel.
After: The Nail, Demon Baby, Satanic Bible, Daemon's Tail, Abaddon, Begotten Baby, Maw of the Void, Black Baby, Dark Prince's Crown, Bat Wing, Devil's Crown, Lil Abaddon, Azazel