I think it is probably an achievement that is no longer possible to get. The achievement is for purchasing your first home, which is how we got houses before the big housing revamp this spring. Now you're given your house automatically when you start playing, so there's no need to buy them. :D
I'm working hard on getting my last subway badges. I heard that the subway was "not long of this world". If there is a nat-ur-al disaster that destroys the subway maybe badge could still be obtainable by doing restorative work of some sort?
But there are already achievements for customizing your house. I've never been someone who can/will grind for currants, so it took me a while to buy my first house post-reset and then upgrade to an even bigger one.
It's a trade-off: houses are given immediately now, with no work or currants required (and I think this is a good thing!), but that's one less achievement to get.