Here is the full list of all 12 Airline Director 2 - there are Tycoon Game achievements.
Airline opens first route
Airline has 10 aircraft
Airline has 20 aircraft
Airline has 50 aircraft
Airline has 100 aircraft
Airline has 500 aircraft
Airline starts supersonic flights
Airline is utilizing the low cost strategy
Premium Airline
Airline is operating large aircraft
Airline is operating the biggest aircraft type
Airline has a high number of connecting passengers