Greetings.
This is another exploit for the critter killing guild achievements.
This exploit is at Zul'Drak's arena when you encounter the boss, Orinoko Tuskbreaker.
He does a debuff called Fishy Scent - Spell - World of Warcraft on a random member of your group, this debuff will spawn many ferocious and hungry penguins that count as critters. Simply have a healer or be yourself a healer and dont kill the boss... just wait for the penguins and farm them. ^^
Easy for 85lvls
Thanks for reading!