Here is the full list of all 27 Lust from Beyond achievements.
Finish the game without opening the Xu’thrar.
Beat Amanda.
Get the Mask of Ughro’ecna.
Make love to Amanda in the Trinity Chamber.
Join the Cult of Ecstasy.
Beat Tim.
Set off to rescue Lily.
Meet Amanda Moon.
Find the room dedicated to Lust from Beyond Kickstarter backers.
Meet Dr. Austerlitz.
Commit suicide due to low sanity.
Ask every possible question during your telephone conversation with Dr. Austerlitz.
Arrive in Bleakmoor.
Get rid of Victor’s fleshlight.
Finish the “Queen of Ecstasy” chapter.
Finish the game after opening the Xu’thrar.
Inspect every Dr. Austerlitz painting at the Desire Hotel.
Collect 5 items revealing the story of the Queen of Pleasure.
Collect 5 items revealing the history of the Scarlet Lodge.
Collect 5 items revealing the history of Demiurges.
Kill every character important to the story whenever you have the choice.
Spare or save every character important to the story whenever you have the choice.
Collect all lauv’abrarc figurines.
Collect all clow figurines.
Play the Lust from Beyond: Scarlet melody on the theatre piano.
Watch the Scarlet Lodge cultist defecate for 3 minutes.
Eat 10 candies.