Previously (1.21.43), I could get achievements even if I turned on "Experiment" by re-editing after creating a world. (However, I know that if you turn on "Experiment" when creating a new world, you will not be able to get them.) I can no longer get all the achievements from my previous world... I had to delete all my worlds and start over from scratch...
Linked issues
Comments 5
Thank you for your report!
We're tracking this issue in MCPE-166011, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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If you find any duplicate reports, please comment. Or is this a change in the specifications for 1.21.44? (※Note: All reports and comments are translated.)