On the basis that flying the mosquito counts, I've just found what I assume is a great place to get this without having to tape A down! After you have freed all the Nymphs, new levels unlock for all the old worlds. The second level you play in the jungle has a new level "Up and Down". Just before the end (the last section with the blue dudes who offer you their hands and let you swing on them) the hidden electoon level (top left) contains a mosquito element, and at the end you have to land your mosquito. Kill the dude firing rockets at the end, but not the normal enemy who just stands still. If you leave it in the air, top left and come back 1hr later, land it, the acheviement will pop just after. It popped for me when I exited the hidden level and completed the level.