Train Sim World 5

Despite the Description says 10 Services, the achievement tracker steps 5% after each, so a total of 20 needs to unlock.
There are a 12 mins long what I completed. Right before arrive at the destination in far away (4 miles) make a manual save and after completed it just Resume Last Played from the main menu. This also works with any other Service on this route, but this is the shortest what I found and do not need to complete different services.

Edit: For newbies, the Service found here: Main menu (Home tab) / To the Trains / Choose a Route / Cajon Pass / Timetable / BNSF SD40-2 / Official (on the right side) / "L-VICTH05-05b Local service from Thorn to Victorville" from the list