Just play with people you know and are also good at the game, and make sure EVERYONE has a heavy utility vest. My friends and I recently got the Criminal Mastermind Challenge done because of how trusting we were of each others skills and abilities. Last mission is BRUTAL though.
- Fail first attempt at a setup mission because of a low-level player dying
- Someone else one your team quits after first attempt because "you suck"
- Everyone is kicked from the lobby and sent to Freemode
- Repeat