This one is definitely filed away under Weekend Fun! Kudos to Mozilla foundation, though a bit sad that it doesn’t play on iPad (and some other browsers) yet.
Although it took me only about a minute to track the last achievement down, and figure out that an NPC named Rick is who I need, finding him proved illusive. Even though I had coordinates of the dude from world map definition JSON, it’s really tricky to track him down as game use teleports when doors are opened, to shift you to new area, as I gathered.
So after about an hour of math and checking different door/portal/methods/logic, I just got annoyed and did a quick Google! And voila, of course someone already posted it on our beloved StackOverflow (for Gaming). There you have it – complete fun experience with hidden achievements FTW !!! Next? Just clone the GitHub repo and set of on your own adventure, of making a browser game!!!