If you're on NA, I'll be hosting a squad to get this achievement at reset tomorrow (Sunday Dec 18th). Look for us in LFG or join on my squad.
Just attempted this from LFG today and it is so hard to get people for this, anet really need to reconsider just handing this achievement out to people who already have the first; it is obvious that the player is capable of getting the achievement. Obviously I know they would never do this but man it is lame.