Camera Eye Achievement
Take all optional photos in Episode 3: Chaos Theory
After taking all ten photos you will receive this achievement as well. If you miss any pictures during the story, you can load various areas in "collectible mode" and get them this way without affecting any of your story choices or having to start a new play through. You can check your progress at any time by hitting the Back button and going to the third tab. The pictures there in black and white show hints of what to look out for in finding the other photo ops.