Problems with Realms, which do not activate achievements; when the world is downloaded, it appears that he used tricks. When you replace the world that didn't use cheating, it doesn't activate achievements.
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Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Incomplete. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.
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However, this issue has been temporarily closed as Awaiting Response
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