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This is a clip from my Apocalyptic 100% Walkthrough
As far as this achievement goes, this is the absolute easiest way to get it. There is one place in the Twilight Cathedral that it is also possible, but it is very difficult. In the main lobby (where you drop the big statue being held by the hanging monster down the center of the floor) you can try to run around the pillars to wake up enough Duskwings to get the achievement.