Here is the full list of all 20 Nocturnal Visitors achievements worth 1,000 gamerscore.
Handle The Conjurer's arrest on your own.
Allow the young woman to handle The Conjurer's arrest.
Choose to stay in bed instead of looking for Bruno.
Look at Jamie's books.
Look at Jamie's washing machine.
Search Riley's closet.
Talk to the conceited man in Old Town.
Dance with the villagers in the fairgrounds.
Manage to piss off the seller in the fairgrounds.
Listen to all the fairgrounds' clown's jokes.
Look at yourself in Syphon's flat.
Break the vase in Faith's Inn.
Look at the computer in SEEK's office.
Look at the letters in the father's room.
Read Agent 25's file in the archive.
Read Agent 23's file in the archive.
Look at all of the special paintings in the museum.
Fail to find the Vulsana on time.
Look at the graves in the abandoned camp.
Complete Nocturnal Visitors.