This is a simple macro that targets the nearest ALIVE turkey and casts the macro'd spell, considering how many people don't loot the Turkeys i've found the macro to be incredibly helpful, being a rogue I macro'd "Throw" to kill them.
Dependant on class replace "Throw" with any instant spell/attack that deals damage.
/tar [nodead] Wild Turkey
When a Turkey is targetted, simply run/spin around and kill it, easy achievement
I tended to stick to the bottom of Elwynn Forest near the river and went from the west edge to east edge. FYI.