http://www.youtube.com/watch?v=CZNJtR_54aY

I really feel like Blizzard dropped the ball on these quests by not making them instanced in some way, like Peacebloom v. Ghouls. As such, these quests & achievements are, and will probably be for the foreseeable future, player-vs.-his-own-faction deals like most of the Battleground flag-touches. Each additional player trying these quests simultaneously increases the difficulty exponentially.

The method demonstrated here should be mostly agnostic to the other players. As long as you count right and can find 2 traps, you're good to go.

Still, I would recommend getting these now before the flood of new goblins (and new characters in general seeking something different than the Barrens) really makes these impossible.

Tec