since no one wrote a solution and I had problems with this I thought I would share my conclusions of a hidden requirement in order to get this.
requirements:
* ranked match
* only "round over" and "victory" allowed (no "failures" i think but not 100% my group never failed)
* if the person needs it they MUST host it or have someone who needs it host it, if someone has the achievement already and hosts it you won't get it even if you "victory" all three maps (this was the key I did not realize)
my reason for the third rule is the following scenarios that happened.
first time two other players and myself went in. myself and one of the others needed it, but the third person already had it and hosted the game. we victory'ed all three maps and no achieve popped for anyone.
next time I hosted it and the first one we round over'd (did not trap 20 ghosts in containment), and then had two victories. at the end the other guy and me received the achievement.
hope this helps if anyone else was having problems getting it.