Would it be possible to enable GOG overlay for Desperados III? Minor issue, but I wish I could have used GOG's FPS counter.

It is not working for me either and as a result of that I'm not getting achievements.

I also have the feeling, that achievements are broken in this game. The first and only achievement I got was for blowing up the bridge... after 11h in the game xD ... during the tutorial mission you can decide a duel by flipping a coin respectively distracting one of the opponents. I did this, but did not get the achievement for it...

When i unlock achievements, i also don't get any ingame-info but nevertheless they are unlocked and shown in GOG Galaxy when i end the game. So maybe your achievements aren't broken but simply not shown in the game?

I fixed this issue. If you want to get achievement pop-ups, read here:

https://www.gog.com/forum/general/galaxy_overlay_fixes_for_games_that_are_officially_supported/page1

That looks good!