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