Police Chief - 30
Complete all combat tours.
*I don't think this can be done with spiderman, but if you can beat them with them congrats. Venom is your best bet. The best way I have found to do it is to jump high up and use you web to pull enemies up in the air. Attack them, and repeat til you fill up you meter. Unleash your rage on either the guy with the weapon, or press RB and Y to take out a bunch at a time.
Want to clarify... is Venom unlockable or do you mean "black spiderman suit"?