Bloodfather and Better Cordy Achievements

[Doma]

Hi guys,

I've been looking to get all the achievements and have done, all apart from two. The Blood Father and Better Cordy boss achievements. I've been trying time and again to get these achievements but for some reason everytime I play I get all the way to the end and the stages are almost always either the Plague Doctor or The Imaginaries or whatever. It's getting pretty frustrating having to play the game through so many times to get these relatively easy achievements only to be unlucky on floor bosses.

Anyone got any ways to reliably get these bosses or is it just a case of mashing my face against the keyboard until RNG gifts me one of them?

[Adelion]

As far as I know there is no way to trigger certain bosses. So yea, you have to keep running to the library floors and hope for Lady Luck to strike again. And then you have to consider that the Blood Father achievement is really evil O.o