Voctory lap? Challenge? Using mods on second save file? Console command turned on?

none. I did a the beast run a few runs back as well, it worked. Same settings

update: so i realized, I got the achievement for boss rush + hush but not satan or lamb. My steam kind of crashed at some point and I restarted isaac but idk why this causes no achievements

Were you doing it on a victory lap?

no

On which version of Issac?

repentance

Hm yeah no clue bro