ok in this post i will be talking about the critter killing squad guild achivment.
as u might no blizzard have been busy hotfixing most of the other areas to get this achivment like the one in uldum.
But i belive ive found another. Head to this area in howling fjord on the map and there is 3 ice burgs with penguins on. clear all ice burgs then some penguins on each iceburg should have respawnd. just repeat this and u should be good