Like the rest of this DLC, this is very simple.
There are 29 ZDC Cameras around the map, simply walk up to them and press the B Button. You will know them when you see them as they are marked on your map when you are in that certain part of the map.
They are marked with a Yellow Circle with a Black Ring inside of it.
Thank you WylieMD for point this out:
You MUST obtain all collectibles BEFORE completion of the campaign. If not, you will have to start the campaign over. Not like that's too bad though, the whole thing took about and hour and 45 minutes to get all achievements.
There is really no location map needed for this guide, I obtained this as I was going through the story.
***EDIT***
This achievement has been known to be a little glitchy, and cause some of the Cameras to not appear on the map. A consistent way to fix this glitch is unknown at this time. It does seem that starting a new game can help though, so try that first.
Also, if you vote negative, please explain why, so that I may improve on this solution.