Here is the full list of all 38 Cities: Skylines II achievements.
Unlock 150 map tiles in a single city.
Experience a forest fire.
Build 10 signature buildings in a single city.
Experience a hailstorm.
Experience a tornado.
Have 20 active transport lines. These can be passenger or cargo lines or any mix of the two.
Have 6,000 citizens treated at medical clinics or hospitals in a single city.
Build a city where at least 20% of the population has a university level of education.
Have a total of 10,000 tourist visits in a single city.
Have at least 1000 citizens and a city attractiveness rating of 90.
Use the photo mode to take a screenshot.
Assign a policy to a city district.
Unlock 50 map tiles in a single city.
Build 5 signature buildings in a single city.
Reach enough milestones to unlock all city services in a single city.
Have at least 1000 citizens and an average happiness rating of 75%.
Have buildings from all four zone types in a single city.
Build city with residential, commercial and industrial zones, water, and electricity.
Have a look at each individual info view panel.
Create a city district and assign a city service to that district.
Unlock each building available in the base game.
Reach a population of 100,000.
Have a city that produces electricity by only using renewable energy sources.
Build any airport.
Have 5 city policies active simultaneously.
Create 10 different districts in a single city and assign policies to each.
Follow a citizen's lifepath from childhood to old age.
Use the editor to make a map.
Reach milestone 20.
Experience all four seasons by building a city in a climate with a snowy winter.
Have 50 active transport lines. These can be passenger or cargo lines or any mix of the two.
Have at least 1000 citizens and an average happiness rating of 25%.
Use the editor to make an asset of any other type than map.
Have a total loan of at least 200,000 in a single city.
Build 10 parks in a single city.
Plant 100 trees or bushes with the landscaping tool in a single city.
Bulldoze a total of 1000 buildings.
Build all unique city service buildings in a single city.