I know that's not a bug but I hope you change it soon why achievements system not like PC version, I mean you hqve new achievements in each new world you create .
I thik it would be better
MCPE-16797
Achievement idea not a bug hope you read it
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Sorry, this ticket is invalid because the official bug tracker is only for bugs, not feature requests. To request new features please use https://feedback.minecraft.net/ or http://www.reddit.com/r/MinecraftSuggestions