Just completed the weekly challenge of completing 4 sets of co-op firefight on heroic like it says. Took us about an hour and a half, and by the end of the 4th set when the game ended, the challenge still says incomplete. Don’t think we did anything wrong, just want our 30,000 credits we spend over an hour in firefight for. Anything?
Happening to me as well.
The 5th set must start.
Best enemies are Elite Generals, they are fast and only 6 per wave.
Your weapons should be Concussion Rifle and Focus Rifle.
Set damage to 300% and yourself invincible (because if an enemy shoot, kill him and took the attack, the damage received is what you inflict, so 300%, it’s the same for a friendly A.I. on your vehicle) .
And a custom skull to make the enemies weak, with bad luck but that can see and hear you well (just to lure the AI. towards you faster) .
Yea, you need to start the 5th set.