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
Got lost in the curves of a beautiful woman
Told The Baron about Lisa
Watched the music video
Solved the case
Lisa was arrested
Drove up the mountain road
Arrived at the vacation house
Arrived at the casino
Entered the apartment
Talked to the pirate
Entered the gardens
Completed the tutorial
Arrived at The Baron's mansion
Started a new game