Cabaret Achievements
Amateur Night Victory
Covered in Amateur Night at the Live Cabaret
Win Without Nudity
If you do Amateur Night at the Live Cabaret and stop the routine before you remove the bra, it should be enough to win without nudity.
Live Sex Act
Do the complete routine Amateur Night at the Live Cabaret, this can only be done if you go the Cabaret without Rebecca.
Two Nude Dancers
This is covered in the The Rebecca Trilogy 2 – Strip Club walkthrough after Ariane’s nude win.
A Dirty Mind
Basically covered in The Rebecca Trilogy 2 – Strip Club but Ariane’s routine must be perfect and so should yours. After Ariane imagines a threesome the achievement is unlocked.
Date Ariane Games 
Dirty Mind does not seem to work in the new HD version. Ariane never imagines a threesome.