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