Here is the full list of all 22 Lust from Beyond: Prologue achievements. It takes around 2-3 hours to unlock all of the achievements on Windows.
Turn of censorship during gameplay.
Complete the game in censored mode.
Finish the game.
Walk through Lusst'ghaa without receiving damage.
Pick up all the touchable items in the game.
Find and use all the first aid kits.
Find and use all the sedatives.
Look at unconscious Mabel for 3 minutes.
Read all the notes.
Pick up the devil mask, when the light is out in the mansion.
Look at the cultist orgy for 5 minutes.
Pick up all the masks.
Collect all the ritual items.
Talk to the prisoner under the stairs.
Collect all the lauv'abrarc figures.
Open the secret locker in Theodore's bedroom.
Open the tabernacle with as few moves as possible.
Read all the letters concerning Mabel and complete all the conversations with her.
Pick up all the items in Theodore's room.
Don't show any doubts speaking to the Cult members.
Spend a minute reading prayers from Iauv'abrarc's altar.
Finish the dream about the land of Lusst'ghaa.