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If the other versions have them, why not GOG?
Just to be concrete, Enigmatis 1 doesn't support achievements on GOG at all: It offers no in-game achievement section and its achievements aren't integrated in GOG Galaxy. Both Enigmatis 2 and 3 though offer in-game achievements, but they aren't supporting GOG Galaxy achievements either (afaik).
Post edited January 04, 2022 by DeMignon