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