To make things clear:
Horror = Zombie.
Brutality = Dead zombie/blood.
Outtake = Funny things. e.g a zombie with mask on.
Erotica = Sexy e.g. a massager/anal probe.
Simply try and create a situation with all of the above. If you want to get this achievement quickly try this...
In the Uranus zone is a whackamole game called Molemen from Uranus, next to it is the souvenir kiosk, go there pick up a few anal probes & the alien head from the counter, then run near some zombies, place the anal probes on the floor (for erotica), kill a few zombies (for brutality) & then put the alien head on a zombie (for outtake). Then you have to take the picture making sure the dead zombies, alien head & anal probes are in the frame with a few zombies too and you will get the achievement.