Here is the full list of all 12 Lust from Beyond: Scarlet achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
Solve the puzzle in the theater with the least number of spins.
Escape the theater by killing all the members of the Scarlet Lodge.
Listen to the recording from the voice recorder in a secret room.
Collect all voodoo figures.
Finish the game.
Escape the theater without killing anyone.
Examine all objects containing text.
Finish the second trial.
Finish the first trial.
Have sex intercourse for at least 3 minutes.
Meet with Rhea.
Press the piano keys 50 times.