Alright everyone, I am not adding anything to this achievement that hasn't been said in one form or another, just making some things a bit more clear. Our boosting group FLEW through this because we had supreme co-ordination. Here was our play-by-play:
1. Obviously you'll need a grand total of 6 people, all need to have mics (do not try this with someone without a mic, it just doesn't work).
2. Join in a liars dice game. Now before you start going around the table, have somebody be the designated counter. This person is to grab a pen/notepad and tally up everybody's dice of choice. DO THIS WITH PAPER. I was trying to count without paper, and if somebody speaks out of line, you could forget the dice count, and have to recount quickly or risk messing up the flow.
3. Establish an order of who speaks, and have them talk in third person. this eliminates ANY confusion. the designated counter will be able to clearly get the right amount of dice. (John has 2 SIX, Killer has no SIX, etc). Using numbers might mess up a count of dice, so use your gamertag or real name!
4. Shuffle around the table by bidding 1 ONE, 1 TWO, 1 THREE etc. until the player sitting next to the achievement receiver is bidding, and the designator will give him/her the total dice count for the designated die (everyone seems to like SIXES). P1 will make the bid, and then the achievement receiver (P2) will call spot on.
5. One major change we made, is that when it gets down to everyone having one die left, sometimes there won't even be a SIX on the field, therefore causing a recount, possible failed attempt, etc. HERE IS WHAT TO DO. the Designator (die counter) will look at his/her die, and tell the playing field what it is. Then, the playing field, in their respective order, will tell the Designator how many they have of that particular die, and then P1 can call it and P2 can get their achievement. This guarentees that there is at least one dice on the field so their does not have to be a recount.
6. If somebody makes a mistake, just back out and restart by shuffling around the table to the P1. If the bid accidentally autos in and it is the achievement receivers turn to bid, have him raise it and the next guy bid ridiculously, so that the fourth guy can call bluff (P2 will not lose a dice). Mistakes happen, however we made no mistakes using third person acknowledgement and a Designated dice counter for our group.
using this method it took us no more than 30 minutes for every single person to get their achievement.
hope this helps in addition to the above guides!