I liked it.
But how would you deal with ties?
I haven't played that many times, but I think that most of the time everybody gers every type of card (at least w/ the base game).
In my experience it is better strategically to focus on only a few types of cards. If you paint panoramas, concentrate on that. If you want souvenirs, concentrate on that, etc.
As for dealing with ties? Same as with the other achievements: Every tied player gets the 3 points.