Here is the full list of all 51 Cities in Motion 2 achievements. It takes around 60-80 hours to unlock all of the achievements on Windows.
Have a line 1,000 meters long
Have a line 2,000 meters long
Have a line 5,000 meters long
Buy a vehicle
Have 50,000 citizens in the city
Win a multiplayer game
Build 1,000 meters long road
Complete the campaign Modern Days
Have no private motoring in the city for 48 game hours
Transport 1,500 passengers using 2 vehicles in one game week
Have 100% reputation
Have 0% reputation
Transport 1,000 passengers
Transport 10,000 passengers
Transport 100,000 passengers
Have 10 vehicles running
Have 50 vehicles running
Have 150 vehicles running
Have 75,000 citizens in the city
Have 100,000 citizens in the city
Have 150,000 money
Have 300,000 money
Have 1,000,000 money
Have 3 tram lines
Have 10 tram lines
Have 25 tram lines
Have 3 bus lines
Have 10 bus lines
Have 25 bus lines
Have 2 metro lines
Have 8 metro lines
Have 15 metro lines
Have 3 trolley bus lines
Have 10 trolley bus lines
Have 25 trolley bus lines
Have 2 water bus lines
Have 5 water bus lines
Have 10 water bus lines
Have 100% coverage
Have 30 lines
Have 60 lines
Have 100 lines
2 hours played
10 hours played
60 hours played
Play 2 sandbox games
Play 10 sandbox games
Play 60 sandbox games
Play 2 multiplayer games
Play 10 multiplayer games
Play 60 multiplayer games