I was just looking at my councilroom page again and noticed that for 2 of the 3 linked achievements on it, the links were to games that did not fit the bill of the achievement: I supposedly "bought nothing but gold/silver" in a game where i finished with 6 hunting parties, and was a "one trick pony" in a game where i bought several of hunting party, horse traders, and islands. Looking at it this way, it seems to be ignoring cornucopia.
It's clearly not a big deal but I thought i'd report it in case it's the symptom of a larger problem.