The Galaxy overlay has been disabled for these games and therefore you also won't get any popup the moment you unlock an achievement. The disabled overlay can be forced with a config line in Galaxy but of course there is a reason why they disabled it. Usually with enabled overlay you will get a black screen whenever you unlock an achievement because the overlay is not perfectly compatible with these games. This fix prevents the black screen to happen so that you get your typical Galaxy popup whenever you unlock any achievement and you still can play the game normally.

There's an instruction file inside the package that includes a link to a guide on how to force the overlay as well as two wrapper files and a few config files I used to fix this, The wrapper files are taken with permission from the "Special K" wrapper. Technically the included Special K wrapper adds its own overlay and therefore somehow fixes at least the Galaxy popup and prevents it from causing the black screen.

I only tested it myself and I hope that I have included every file and config you need for this to work. Since I just tested it a bit I cannot guarantee that this will work perfectly ... so use it at our own risk ;) However if you should experience any problems after using this simply delete or rename the two wrapper files that are included in the package from the game directory to disable the wrapper completely.

If you want to try it you can download the fix here.