If you own the game on Steam, the easiest method is the Steam Workshop.
Cause: You haven’t beaten Mom once since installing mods. Fix: Temporarily disable all mods, beat Mom (any character), then re-enable mods. Achievements will now work permanently on that save file. how to install mods the binding of isaac repentance
This is normal. Once you enable mods, the game appends [MODDED] to your save name. Your unmodded save is still safely stored. To go back to vanilla, disable all mods, restart, and your clean save will return. If you own the game on Steam, the
Before beginning, users must understand two critical mechanics unique to Isaac: Cause: You haven’t beaten Mom once since installing mods