Hi!
So I have done this with random strangers before for sets 1 and 2, and both times made good friends out of the process. I am an 18k AP player who has played since the open beta, and am an avid dungeon player, Tequatl leader, guild leader, and so forth. I’m willing to do pretty much anything in-game as far as activities go to play with the person who is doing this for me, not as a payment, but more as an “I want to make friends” sort of thing. Both of the people I’ve done sets 1 and 2 with have become close friends, and I think that sort of a friendship has carried more value than whatever gold cost might have been associated with “renting” the minis.
Anyway, basically what I’m asking for is the ability to borrow all of the set 3 minis to get the achievement, and then I will send them back. I don’t want to get banned for scamming because I’ve spent far too much time on my account, and hopefully my reputation precedes me elsewhere with good behavior on the forums and stuff. Anyway, if you could possibly help me get this achievement before the feature patch, that would be amazing! 
Thanks for reading if nothing else. 