So having completed Crackdown I figured I would go and try and get all of the hidden orbs I didn't find already.  So I looked up a map for the orbs and got to hunting.

When I finished the map I was missing about 13 orbs because some I couldn't find and I figured I had already gotten.  So I deleted my completed game and decided to start again from scratch and this time document all of the orbs I have collected.  Im about half way done at this point and have been keeping track of all the ones I've collected so far.

Surprisingly the game is still fun even though I've completed it once already.