There are times when I go into the achievement list there are two of each achievement.
It will go away eventually, the extra achievements will go away but it's pretty annoying.
I have come across this bug several times
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Thank you for your report!
We're tracking this issue in MCPE-38111, so this ticket is being resolved and linked as a duplicate.
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I came across this once on my switch, and I saw something like 7500/7600 gamerscore even thou it's not possible.