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There seems to be achievements in the gog version as well. Even without logging into they unlock. They don't seem to be in the main game directory, as I uninstalled and reinstalled the game to check. Kind of an interesting choice, haven't found where they are stored on my machine yet.

Update: Found the achievements file. Seems to be saved in the saved games folder in C:\Users directory. A neat piece of info for anybody curious.
Post edited April 02, 2023 by theoogleking
These ingame achievements don't seem to work. They do properly register during the game, but they don't seem to be permanently recorded :(
If there's anyone here looking for a way to turn off damage indicators in the game (the red stripes around the crosshair) then I found the solution.

Simply extract file "pakMOD_damage_indicator_off.pak" to baseq2 folder.