How about a good old-fashioned text guide? This is actually very easy if you have any sort of FPS skill. Here's what to do, step by step:
- Play on Regular difficulty, obviously.
- Run through the mission once to learn where the beacons are.
- Call in the Recon Drone immediately after starting, tag the first beacon.
- Sprint there and take out any guys that are directly in front of you, ignore any that aren't in you immediate path to the beacon. Plant the beacon.
- Head around the right side of the ship and take out all enemies in your way. Run up to the corner after you've gone up some stairs and call in the Drone, and tag the beacon.
- Run straight through the little "tunnel" room and kill all the guys hanging around the other side of the ship. Go into the corner and use the Drone again. Plant the beacon.
- Go back into the "tunnel room," and head up the stairs, still killing anyone that's in your path while ignoring everyone else. - Run up another set of stairs on the left, heading towards the bridge. Call in the Drone as soon as people stop shooting at you, tag and then plant the beacon.
- Head back the way you came, using the same staircases into the "tunnel room." Before you head down the first staircase after the bridge, toss a flash at the like 10+ guys that are camping there.
- Head down and keep to the right side of the ship as you retrace your steps. Once you start getting close to the area where you placed the first beacon, you'll see 3-4 guys running towards that area from the opposite side. Flash those guys and keep running.
- Run down a staircase on the right, close to where those flashed guys were, and then keep running up the next staircase and get on the chopper.
I finished with a time of 2:40 the second time I tried to speedrun it using this path. On my first attempt, I finished with 3:40 and I forgot to plant TWO beacons and had to run back. In other words, the time limit for this achievement is very generous.