Here is the full list of all 23 Sexual Void achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
Unlock all the eyes
Unlock all the hairstyles
Unlock all the accessories
Unlock all the skins
Unlock all the full bodies
Unlock all the shirts
Unlock all the stockings
Unlock all the skirts
Unlock all the panties
Complete the 5 minutes JOI
Complete the 20 minutes JOI
Unlock all the bras
Complete the 10 minutes JOI
Unlock the 80's Void
No orgasm today, retry tomorrow
Ruin your orgasm and eat it
Eat your orgasm
Ruin your orgasm
We like to call him Rodolfo
Complete the 1 minute JOI
Complete your first orgasm in the Void
Use the panic button
Enter for the first time in the Sexual Void