I would be very surprised if this gets ever implemented, however sound it might seem to most of us (myself included).
Firstly, the current options for PF have the underlying meaning of "preference", not "requirement" (at least I get this impression). It's just a message what kind of behaviour one might expect joining that party. So mixing such strict option in there might not be the best idea (of course, there would be ways if they really wanted).
Secondly and more importantly, regarding MMO's generally, I believe that developers kind of have to follow this unwritten rule there is no way the community is able to easily reject the "bad/immature" players. Of course, there is "vote kick", blacklist and such, but I think this is as far as we can ever get. One of the reasons might be that they want (need) to prevent the community from getting too "elitist", even if this particular suggestion is far from that (however, 9/10 cases this option would be checked if implemented, imo). Additionally, it is likely that lots of young/immature people are playing the game and therefor making an option that would allow people to block them from accessing certain features is not really smart, at least from business perspective. The likelihood of people leaving the game because they can't access party finders is bigger then the likelihood of people leaving because they run into someone "new" joining PF with "farm" in the description here and there.
And so I believe we are left with ourselves to deal with this. The best shot would probably be to put very strict and specific rules by yourself in the PF description (like "going to check achievements"). Although, some might be familiar with Guild Wars 2. There I believe this approach leads to very hostile environment for almost all new players (zerker 5k+ meta, no noob or kick). Next thing might be having the strong and matured community actually teach all the bad/immature people that this is something you don't do (yes - naive).
In retrospect, having this option might actually be easier for the player to grasp. Like "wtf I can't join this PF, lemme check, ohh, it's for those that have a clear, ok". So yeah, all in all, not a bad idea. You've got my vote if you ask.
edit: Holy shit, there is still the 1000 char limit - see, they don't even want to let us complain, yeah - this is not getting implemented. :P