The December Update Title update for Station to Station has 10 achievements.
Complete the star challenge in Sunforge Sands level 5
Complete the star challenge in Flint Hills level 3
Complete the star challenge in Nugget Creek level 3
Complete the star challenge in Eveningstar Valley level 4
Start a custom game.
Beat a custom game.
Beat a custom game that's set to high cost.
Create a regular station with 4 passenger connections in a custom game.
Finish a very large custom game map with very long distances, very shallow curves and very gentle slopes.
Finish a very small custom map with very high cliffs, short distances, very steep curves, very steep slopes and high cost.