Co-Op - Exfiltration

Exfiltration - Co-Op

This can only be done online with a friend. Each mission has a corresponding achievement by accomplishing specific tasks. When attempting to unlock achievements, it is actually recommended to play the mission in Easy mode.

Bonus:  Reach the VIP without setting off the alarm to unlock the "Ninjas" achievement

Again, recommended on easy difficulty and preferably with a friend. Having headsets is critical for communicating and timing your shots. You must take out the guards with one shot, so having individual targets and countdowns for synchronized shots is vital for this achievement. Aside from guards, you also need to disable CCTV cameras that will alert the guards and sound off the alarm.

Start by dispatching the guards watching TV, then sneak behind a couple more guards in the laundromat and drop them. Don't move just yet; there's a CCTV in the corner past the door so carefully take aim and destroy it. Go through the door and carefully look behind the metal railings to find another CCTV in the corner and one more adjacent to it, in the end of the corridor.

Continue through the door to spot another guard. Kill him then slowly ascend the stairs. There is a CCTV here and a guard that both of you must shoot down. Pick your targets then take them out. Continue upstairs and you'll find three targets this time: two guards, one camera.

This next set of targets is a tricky and probably the hardest part of this mission. One of you guys must line up by the staircase to the right so you can take out the guard nearest to the stairs and the CCTV. Mess this shot and you'll miss the chance to unlock the achievement. Take your time to set up then take them out when ready. Continue to the last corridor and pop the last two guys out and you should get the achievement. Reach the VIP to complete the mission.

Thanks to TheGamerReview for the very helpful pointers.