The Oklahoma Add-on for American Truck Simulator has 4 achievements.
Discover every city in Oklahoma (requires Oklahoma DLC)
View cutscenes from all 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 both tyre factories in Lawton and Ardmore (requires Oklahoma DLC)