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I have a problem with the achievements, and when I downloaded the new version and transferred my previous saves, the achievements were reset, leaving them at zero. Can you tell if it can be fixed or should I start a new game?

IIRC, the achievements data is stored in the persistent file, did you transfer this file too?

I don't know, can you tell me how to do it?

In your previous post you said you transferred your previous saves.
Persistent file should be in the same folder as your saves.