Here is the full list of all 11 Slappy Ass achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
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Unlock all items
Score 800 points in Endurance minigame
Score 700 points in Dexterity minigame
Jiggle the bells
Score 500 points in Rythm minigame
Squeak the bunny tail
Use kinky toys excessively
Use electric grab
Use kissy grab passionately