Here is the full list of all 27 Agatha Christie - there are Murder on the Orient Express achievements.
Finish chapter 13.
Complete a new game without using a single hint.
Collect all the golden moustaches.
Finish chapter 12.
Confront the real killer without making mistakes.
Finish chapter 11.
Solve the chess workshop.
Complete the Characters menu.
Finish chapter 10.
Finish chapter 9.
Finish the chase without losing sight of the killer.
Make the pigeons fly away in Venice.
Finish chapter 8.
Finish chapter 7.
Finish chapter 6.
Convince Count Andrenyi at the first attempt.
Dodge Arbuthnot's punch.
Finish chapter 5.
Finish chapter 4.
Finish chapter 3.
Finish chapter 2.
Finish chapter 1.
Find the right ingredients by looking at Freja's dessert.
Finish chapter 0.
In a new game, do all the confrontations without ever making a mistake.
Confront the twelve jurors without making mistakes.
Find the code to Joanna's briefcase without asking Bouc to keep quiet.