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