Since it's been revived, another option would be Playnite if the user interested uses Windows.
Been a while since I used it, but iirc, you need to download the
Playnite HTML Exporter extension, apply it to Playnite, find it in the top bar menus and make it generate the HTML list.
With the file in hand, open it on your favorite browser, sort as list, select all, paste into something like Notepad++ or Sublime Text, and clean up the list (can be rather quick with either macros or regex, iirc).
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Alternatively, if you use gogrepoc, you should be able to get a list through it too.
You need make a copy of the tool's "gog-manifest.dat" file for your account (just as a precaution since it's an important file), open the copy with something like Notepad++ or Sublime Text, and clean up the file with regex.
For the regex part, first, you need to erase the first occurrence of:
'long_title': '
As well as everything above it.
And then replace every regex occurrence of:
'},\n[\s\S]*?'long_title': '
For just:
\n
Some titles seem to be skipped for some reason, but if you got the time and patience for that, you can try to compare with what is outputted with replacing this instead of the above:
'},\n[\s\S]*?'title': '
For this:
\n
