Here is the full list of all 19 Airport Simulator 3: Day & Night achievements.
Successfully complete a day where you manage the maximum number of flights.
Reach player level 10.
Read all interactive help messages on the airport.
Fully upgrade an employee's skills.
Drive every vehicle in the game yourself to complete an assigned task.
Earn enough so that your total money is 500,000.
Fully upgrade a vehicle.
Get an additional gate for bigger planes.
Fulfil a task of deicing on the airport.
Complete a full day (without buying off or skipping any tasks) by assigning hired workers to vehicles.
Park a vehicle in one of the new garage.
Fulfil a task of cleaning a plane.
Reach player level 5.
Earn enough so that your total money is 200,000.
Complete a full day (without buying off or skipping any tasks) where you perform all tasks yourself without assigning any workers.
Complete a task with a worker who you explicitly hired.
Complete a task with a vehicle you bought.
Complete your first day on the job.
Complete a task with a rented vehicle.