hmmm… perhaps not.
The obvious thing to do was to level a DH to 70 on Asia… expecting the Necro box to be checked. Nope !
I’ll let someone else figure this out 
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@Yauta: it might be useful if you could post a screenshot of your achievement, and say what region it’s for, and what heroes you’ve reached lvl 70 with…
Instructions for posting a screenshot are in this post: Sound Device list jankiness - #2 by Meteorblade-2266