Here is the full list of all 28 The Bunker achievements. It takes around 3-4 hours to unlock all of the achievements on Windows.
Find the missing puzzle piece
Find all of the toys
Find toy: Nurse
Read all documents
Find toy: Engineer
Choose to leave
Choose to stay
Finish Chapter 12: Cold Storage
Finish Chapter 11: Awakenings
Finish Chapter 10: Descent
Find toy: General
Listen to all cassettes
Find toy: Churchill
Finish Chapter 9: Radiation
Finish Chapter 8: Broken
Finish Chapter 7: Air Filtration
Find all computers
Finish Chapter 6: Alarm
Find toy: Soldier
Finish Chapter 5: Replace Fuse
Find toy: Commissioner
Find toy: Doctor
Find toy: Sam
Finish Chapter 4: Failure
Find toy: Mother
Finish Chapter 3: The Routine
Read all books
Finish Chapter 2: Last Goodbye