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This achievement is the same as except that instead of killing one of the mobs you have to kill all of them. Check out the Medium Rare page for more information on where to find the mobs, including a nifty macro to automatically target any of them if they're close.
It's advised to use a rare finding addon, such as NPCScan or SilverDragon, when going for the achievement to make things quite easier when flying through the zones.