Despite shipping native Linux versions of quite a few titles, the GOG Galaxy client is still not supported on Linux (and both the client and API are closed, so

Despite shipping native Linux versions of quite a few titles, the GOG Galaxy client is still not supported on Linux (and both the client and API are closed, so no community port any time soon). That means no achievements, multiplayer matchmaking, cloud saves, update rollbacks, or game update notifications for Linux users (although the last one is do-able with the Lutris runner or Minigalaxy).