kacek17: Since couple of days at least steam itegration (don't know about others) isn't updating. Myself and my friends have gained some achievements, but they don't appear inside galaxy 2.0. Forcing refresh isn't helping (galaxy 2.0 pulls some data, as resource monitor shows)
Can you go to "Settings" (gear icon in GOG Galaxy 2.0) and click "Report Issue"? This will generate a report with some logs from the client attached that will help the author of the plugin greatly.