This achievement is very easy to get. Cameras are on walls and the direction they are pointing moves around. It will show as a light on the ground but if you press the Back button you can see where exactly the camera is pointing on your map. To disable a camera, you have to find a yellowish box on the wall somewhere around the camera. The boxes are not always right under the camera but you should see them very easily. Just go up to the box without letting the camera see you and press X to disable it. If the camera sees you, you have a couple seconds to get a way before enemies come to kill you.
In the whole game there are 13 cameras that you can disable so you don’t have to disable every one that you come across. You can get this faster by hacking a camera and then reload your last checkpoint and hack the same camera. Do this 10 times and you have the achievement.