There are no acheivements for this event.

Just some free food/drinks, the bit of rep, and the book of flavor text. Gives you a reason to go to Ashenvale or Western Plaguelands, find a nice hill, and pick people off, though

I'm on an RP server, so I tend not to use my boxing for evil, as few are flagged, but if I were on PvP, this is one of the events I'd find hard to resist