Steps to Reproduce:
Make sure you have the new "Create New World" UI.
Select Survival mode in the General tab, and enable Flat world in the Advanced tab.
Observed Results:
Achievements are disabled, despite cheats not being enabled and the default player permission not being Operator.
Expected Results:
Achievements are enabled.
Thank you for your report!
However, this issue is Working as Intended.
The report you have submitted is working as intended: When creating a new world in survival mode and choosing flat world in advanced options, there is a notification present that says: "You can't earn achievements". By clicking read more, user can read that enabling flat world turns off earning achievements, as in flat word there are no resources to obtain (3 blocks deep there is bedrock present). .
Please note, that mechanics of the game may change between updates.
Things such as graphics, sounds, world creation, biomes, redstone, villagers, and animals may not work the same in current versions.
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