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