trinukso: I’d like to thank the studio for releasing the game DRM-free on GOG and, of course, for using its own in-house engine to produce a native version for GNU/Linux.
Because I appreciate that effort, I’d like to play under the same conditions as on Steam: with achievements and cloud saves.
GOG doesn't allow the use of the cloud saves service in native games. A collaboration with the Heroic Games Launcher would be perfectly possible, but it doesn't seem to be happening.
Achievements are available in the native version, as is the case with Streets of Rage 4. I don't know if the developers have included achievements in the native version to be used with Comet.
The game front page says the game has both cloud save and achievements, what are you talking about ?