Battlestations: Midway

I found it bit hard to do in first campaign mission since it's hard to fly 5 minutes there but achieved it without any problem on mission 10 - 'Turning point at Midway' cause you can control any mision conditions easily there.

When you repell all waves of planes at start (if you haven't did this ealier) build 3 wings of B-17's and send them directly north. When you destroy landing AK's (easy to do even with cannons only on fighters) you'll get tip thet enemy carrier group have been detected. Use 2 wings of B-17's to take down one carrier last and you might use 3rd B17 on one of destroyers. When you finish keep destroying destroyer escort by any way you want - B17's, Buffalo's armed with bombs or bombers so only one alone carrier remains, than just keep few wings of fighters close and keep flying them and taking dawn any new planes starting from carrier, when you got 20 (or 40 to get second chievo at once), take down carrier.
Voila...