It gave me an achievement that I haven't even done, I've never reached the end and it gave me the "you need a mint" achievement for collecting dragon's breath in a bottle.
MCPE-218372
A achievenmet who never i do
Resolved
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Are you playing with the latest release version (1.21.73) of the game?
DId you just now receive the achievement, or did you just notice that you had it?
There was a previous bug MCPE-187671 which is fixed, where this achievement was incorrectly granted, so you may have had that bug before.