Aside from unlocking all the achievements, what's the end game like?
How do we know everything is already unlocked, 100%?
Is there an ending cutscene?
To gain all achievements is one part of "playing HS2" (you shortened this pleasure with the 100% save

).
And you see 100% unlocked if you call Fur and open "Achievements" (the one button where the labeling is missing)
These achievements give u access to all possible positions, events, maps and settings for H-Scenes, not more.
Although the possibilities are still depending of the girls mood and stats.
And there is no End scene in this game, the rest is fucking your girls in miscellaneous locations, positions and combinations (3-some) until the end of time
Or you try to get familiar with Charamaker to create your own characters.
Don´t forget StudioNEO for creating your own scenes and animations (not usable in the game).