how to get 'good on my own' achievement?

[Fanfiction aficionado 4000]

I know the achievement is for going to prom alone and having a great time but how exactly does one accomplish that? I tried doing it in the corpse ending and while I suceeded in taking a dead body to prom the achievement didn't pop so do I need to do something different for this achievement?

[Sarasvato]

I think you just have to go alone with high enough stats.

[Phantomfoxy42]

eother have high stats or do the ghost costume route and go alone