Here is the full list of all 22 Lust form Beyond Demo achievements.
Finish the game.
Complete the game in censored mode.
Walk through Lusst'ghaa without receiving damage.
Pick up all the touchable items in the game.
Look at unconscious Mabel for 3 minutes.
Find and use all the first aid kits.
Find and use all the sedatives.
Look at the cultist orgy for 5 minutes.
Read all the notes.
Pick up the devil mask, when the light is out in the mansion.
Pick up all the masks.
Collect all the ritual items.
Open the tabernacle with as few moves as possible.
Spend a minute reading prayers from Iauv'abrarc's altar.
Talk to the prisoner under the stairs.
Collect all the lauv'abrarc figures.
Open the secret locker in Theodore's bedroom.
Pick up all the items in Theodore's room.
Read all the letters concerning Mabel and complete all the conversations with her.
Don't show any doubts speaking to the Cult members.
Finish the dream about the land of Lusst'ghaa.
Turn off censorship during gameplay.