To earn this trophy, you need to take a photo that is an A grade. An easy way to this is to make sure the subject is alive and possibly attacking you and to maybe get a better chance, have it getting damaged by a plasmid such as Incinerate or Electro Bolt. First chance to get this is to photograph the Spider Splicer in the room next to where you get the camera. If you can’t manage to get an A grade there, leave the room and you will hear an explosion and find a Leadhead splicer on fire. Photograph it while it’s shooting at you and you should get an A grade photo and the trophy will pop.