lizrising: Yeah, looks like a bug. You lost, but you did indeed not jump any blue frogs. Did you maybe finish another game right at around the same time, and that achievement was for that one?
(hide) If you are waiting for your turn, click on "change" next to the "refresh" on the main page, then set refresh the page to 30 seconds to get your turn to move displayed faster. (Servant) (show all tips)