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