Here is the full list of all 24 Bionic Heart achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Tanya loves Luke
Luke the great scientist
Luke's sacrifice
Luke ends his life in jail
Richard's menace
Not an illusion
Mark & Julia
A new dawn
Luke and Tina prisoners
Luke marries Tanya
Bionic... hearts
Tanya had a soul too
Happy Ending aka master fanservice ending!
Luke becomes a robot
Julia the fortune-teller
Tanya is a serial killer
Luke is killed by Julia
Tanya kidnaps Luke
You escape to Mars
Tanya kills Luke
Jealous Tanya kills Helen
Luke tries to shoot Tanya
Tanya is arrested by police
Luke never meets Tanya