The Oklahoma Add-on for American Truck Simulator has 4 achievements.
Discover at least 8 cities in Oklahoma (requires Oklahoma DLC)
View cutscenes from at least 6 viewpoints in Oklahoma (requires Oklahoma DLC)
Deliver 5 Bus Hood cargoes to and 5 School Bus cargoes from the bus factory in Tulsa (requires Oklahoma DLC)
Complete 3 deliveries of Big Tyres cargo from at least 1 tyre factory in Lawton or Ardmore (requires Oklahoma DLC)