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