Here is the full list of all 19 PataNoir achievements.
Killed Allan Jameson
Went out in a blaze of glory
Reached all the endings
Let Lisa go
Lisa escaped punishment
Solved the case
Lisa was arrested
Got lost in the curves of a beautiful woman
Drove up the mountain road
Told The Baron about Lisa
Arrived at the vacation house
Arrived at the casino
Entered the apartment
Talked to the pirate
Entered the gardens
Arrived at The Baron's mansion
Completed the tutorial
Watched the music video
Started a new game