Gang Beasts has 13 50 G chievos
Cocoon has 9 50 G chievos
Tunic has 17 10 G chievos, 4 20 G chievos and 15 50 G chievos
Ben 10: Power Trip has 5 20 G chievos and 11 50 G chievos, including a heap of story achievements
Pentiment has 12 20 G chievos
For PC players,
Halo: Spartan Strike has 6 5 G chievos, 11 10 G chievos, and 3 20 G chievos
Also for PC players,
Halo: Spartan Assault has 5 5 G chievos, 16 10 G chievos, and a single 20 G chievo
The console version of
Halo: Spartan Assault has 4 10 G chievos and 15 20 G chievos (more achievements and a higher base score of 1000 to the PC's 250)
And now for the extreme cases. The following games are mostly 5 G and 10 G chievos:
Cassette Beasts has so many achievements that it's quicker to count which ones are invalid, as 91 of its 100 chievos are valid for this target, the majority being 5 G and 10 G with a single 20 G chievo and 4 50 G chievos, leaving
86 5 G and 10 G chievos
Age of Empires II has
147 valid achievements in its base game and 2 title updates (out of 148)
Vampire Survivors has
210 valid achievements (out of 211)
Killer Instinct has
426 valid achievements
And finally,
Halo: The Master Chief Collection has a whopping
673 valid achievements
Personally I'm probably going to finish up Tunic. Unsure what I'll be doing for the 5 G chievos just yet; maybe I'll start Vampire Survivors