and why works with others mods?

and what are the corect areas?

how i fix my achivaments?

im dowload the nuclear apocalypse mod but when i start the game with the mod the gae cashes

i made every thing that this tuturial said to me to install the binding of undertale:https://www.youtube.com/watch?v=SvLa1zKY6rU but when i opened the binding of isaac:afterbirth there was no custumes and the stages was white i cheked the file of the mod but i put all the costume things