So I just killed a wither skeleton with a wither skull on and didn’t get the achievement, playing on Xbox One X, Minecraft, @MojangSupport
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Replying to @MinecraftNews_3
If you think you've found a bug, please visit bugs.mojang.com/secure/Dashb… and report it so that the developers can see. ^SM

Oct 20, 2020 · 9:04 AM UTC

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Replying to @MojangSupport
Got the achievement on iOS.
Replying to @MojangSupport
Got the achievement, Xbox wasn’t recognizing that I was getting the achievement,