Yay me! I got the best Achievement ever, The Turkinator! After a few hours of failed attempts, I finally got it right. The first key was wait until the off-hours. Between 4am and 5am seemed to be the perfect time. There were only me and 2-3 others still running around then. The second trick was to use the southern part of Elwynn, not the northern. The third part was to use my Boomkin spec. And a mount. And a macro:
/target Wild Turkey
I tried doing it as Feral first, but without luck. Too much running, and Moonfiring them down was out of the question. Simply wasn't enough mana for that. But as a Boomkin, I have basically unlimited mana. I've gone with a utility- and manaspec there. So it all turned out to be a matter of switching between spamming my Turkey- and my Mount macro. Never stopped to loot, never stopped at all. Even when I couldn't see where a targeted Turkey was, I just kept moving. Stopping to look around made me screw it up at 36 and 37 stacks a bit too many times. But I got it at last! :)
Oh, and I also went back to Talon King Ikiss (Heroic) again, and this time wearing a Pilgrim's Dress!