To complete Metro Exodus 100% and unlock the Platinum Trophy, you must unlock all trophies/achievements. In this guide we explain the following task to you:
Detach all train cars on the MOSCOW level.
An overview of all trophies and achievements can be found here.
Detach all train cars in Moscow
For this achievement you have to decouple all train cars. This is at the very end of Chapter 1, Moscow. You go through the train and then there are two places where you have to do this. This happens when you reach the two green doors that lead to the next car. Before you go through the door, there’s a handle that you have to interact with to the left of the door.