Let me just do a quick backstory about me...
I changed all the music in afterbirth to the vanilla music (Pure Classic Music Mod). The last update to afterbirth+ made it so that the program only pulls from the game files (*.a). So I tried to get around this by making a basic mod, where changed the music.xml and used the vanilla music. Now, I can't get any achievements.

So, does anyone know how to keep achievements OR know how to convert files from *.a to a file, and back? (I already about Rick's upacker, but that's a one way system)