I see the problem. One thing that we look for in that achievement is the name of the host, which used to always be *.vo.msecnd.net. Since we built this achievement, it appears that the DNS named has changed to *.cache.windows.net.
So we're going to need to update the extension. Until then, you can prob figure out a workaround BTW, congrats on getting all the achievements. You truly are an ace hack.