I was looking over the achievement list for Halo: The Master Chief Collection which has 600 achievements and TA shows that there is One Partly Discontinued/Unobtainable achievement. With so many achievements it is hard to find out which one is the issue. I have been through the list twice now with no luck. Does anyone know which achievement is the problem?
Quick tip; if you click the "View" tab to the right of the game name near the top of the page, you can filter for achievement types (including discontinued). The workaround for the achievement you're asking about requires the disc version. Hopefully they'll fix this one, since they've been pretty proactive about patching this game since release.
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