Starcraft 2: 8 Medivac drop

[Spuddles]

Grrrr. How on earth are you suppose to destroy all the dominion structures before the brood comes in 15 minutes on hard?! I just can't seem to do it! Anyone manage to pass it and found a certain route or strategy they have developed?

Is that like an achievement or something? I can't remember what mission that is, unless it's the one with the stretch-BC.