Here is the full list of all 10 Blind Men achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Kidnap the professor and reach Sergei's B ending
Kidnap the professor and reach Sergei's A ending
Steal the diamond and reach Sergei's B ending
Steal the diamond and reach Sergei's A ending
Play at least one of Sergei's routes.
Kidnap the professor and reach Hunter's A ending
Steal the diamond and reach Hunter's B ending
Steal the diamond and reach Hunter's A ending
Play at least one of Hunter's routes.