Quake II has no Gamerscore

I got the bonus disc for Quake II on the original copy for Quake 4. But came to realize that despite having actual achievements, none of them actually have gamescore. That kinda sucks, especially since you earn them all by just playing the main campaign. Any idea why this is? Or if any other games have done this before?

I got the bonus disc for Quake II on the original copy for Quake 4. But came to realize that despite having actual achievements, none of them actually have gamescore. That kinda sucks, especially since you earn them all by just playing the main campaign. Any idea why this is? Or if any other games have done this before?