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