The Afterbirth Add-on for The Binding of Isaac: Rebirth has 98 achievements.
Nerd x 1000000
Unlocked a new co-player baby.
Unlocked a new item.
Unlocked a new item
Unlocked...
Unlocked a new starting item.
Unlocked a secret.
Unlocked a new character.
Greed just got harder!
Unlocked Challenge #21.
Unlocked Challenge #22.
Unlocked Challenge #23.
Unlocked Challenge #24.
Unlocked Challenge #25.
Unlocked Challenge #26.
Unlocked Challenge #27.
Unlocked Challenge #28.
Unlocked Challenge #29.
Unlocked Challenge #30.
Unlocked a hidden chapter.