Here is the full list of all 50 Black Book achievements.
Meet your beloved one
Guess the road in the cursed forest
Don't release the Mermaid
Complete White Head loyalty quest
Negotiate with Susedko on Zemskaia station
Guess all the Obderiha riddles with the first attempt
Collect 4 copies of each card
Collect all the songs
Become a mistress of Hell
Succumb to Dark forces
Complete Chapter 7
Compose a spell out of 13 words
Answer 40 Knowledge questions
Unlock all the words
Unlock all the black words
Visit 333 locations
Break all the seals
Complete Chapter 6
Retrieve the Book
Collect 70 encyclopedia entries
Collect 50 bailichkas
Complete Chapter 5
Complete Karnysh loyalty quest
Talk with 100 characters
Gather 66 herbs
Complete Chapter 4
Find all the clues in Nemzya
Win 3 times in a card game while cheating
Complete Chapter 3
Take seven demons to your service
Collect 30 bailichkas
Read 77 entries in the Onomasticon
Answer 25 Knowledge questions
Complete Proshka loyalty quest
Complete Chapter 2
Release the Mermaid
Gather 33 herbs
Complete Old Egor loyalty quest
Cow level
Release seven dead men
Collect 30 encyclopedia entries
Acquire 100 sins
Gather 13 herbs
Complete Chapter 1
Complete Nikolay loyalty quest
Collect 10 bailichkas
Win 5 times in a card game
Answer 10 Knowledge questions
Collect 10 encyclopedia entries
Complete the Prologue