I'm going to assume you mean other porn games for achievement hunting.
If you're looking another visual novel porn game, then Summertime Saga, Space Paws and Innocent Witches are good for achievement and gallery hunting.
Space paws has plenty of side and secret sex scenes, hunting those down would be a good use of achievement hunting time.
Summertime Saga actually has in-game achievements for doing certain things and finishing girl's routes, there're plenty of achievements, some require luck and random chance to access, others just simply exploring the game, the gallery is well organised as well. The only downside, is that it's still in development, though it's nearing the end of development and already there's plenty of content.
Innocent Witches has plenty achievements, and getting achievements grants in-game currency used to unlock cosmetics for in game stuff, there's plenty of sex scenes to unlock as well, problem is, is that the achievements and sex scenes are missable meaning that they are only unlockable in certain chapters, and the game is still in development.