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