Have you checked the "manifest-achieves" file in the main Hearthstone folder? There are a number of achievements in there that I haven't been able to figure out yet. (95 total listed in that file) Of course some of them are labeled hidden or internal, so I suspect that these are not available to complete currently, but there are still 38 marked as hero, daily, or starter. (only 31 are listed in your post)
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Have you checked the "manifest-achieves" file in the main Hearthstone folder? There are a number of achievements in there that I haven't been able to figure out yet. (95 total listed in that file) Of course some of them are labeled hidden or internal, so I suspect that these are not available to complete currently, but there are still 38 marked as hero, daily, or starter. (only 31 are listed in your post)