Full list of all 127 Cities: Skylines achievements. It takes around 60-80 hours to unlock all of the achievements in the base game on Windows.
The base game contains 35 achievements, and there are 17 DLC packs containing 92 achievements.
Have a look at all the different info-view panels
Have 15% happiness
Click on a police building 100 times in a row
Use the district tool to draw 3 districts
Earn 15,000 per week
Unlock all city services
Create your very first city
Use the Asset Editor to make your very own asset
Create a map
Apply a policy to a district you created
Unlock Monuments
Build the Medical Center Monument
Build the Hadron Collider Monument
Build the Space Elevator Monument
Build the Eden Project Monument
Build the Fusion Power Plant Monument
Unlock every single building in the game
Have a population of 100,000 in your city
Have more than 10 districts with unique policies
Have 20 transport lines
Have 50 transport lines
Have a Citizen educated to level 3 from 0
Have more than 95% city happiness for 5 years
Have the city survive a crime rate of over 40% for 2 years
Have 5 Fire Stations
Have 5 Police Headquarters
Fill five landfill sites
No water or ground pollution in a city of over 10,000 residents
Have over 70% of citizens highly educated in a city of over 10,000 people
Have an area the size of nine map tiles
Keep the crime rate under 10% for 4 years straight
Have the industry tax rate over 5% higher than either residential tax rate for one year
Have both residential tax rates over 5% higher than industry for one year
Build one quay
Build one canal
Have 1000 squares of leisure specialized commercial zone
Have 1000 squares of beach specialized commercial zone
Have 15 Prisons in the city
Experience 1001 nights in the game
Change Chirper look
Experience rain
Experience fog
Create a winter map in map editor
Experience snowfall
Have one tram line active
Have 10 tram lines active
Have a Sauna in the city
Change Chirper to a winter look
Boost 100 km of streets with Road maintenance service
Have snowplows collect 2000000 units of snow
Experience a tsunami
Experience an earthquake
Experience a meteor strike
Experience a sinkhole
Experience a forest fire
Experience a thunderstorm
Experience a tornado
Experience a special disaster
Have ten disasters hit the same city
Create 10 scenarios
Win 10 scenarios
Lose 10 scenarios
Name a road
Name 100 roads
Name a road "Steve"
Check a route of a citizen
Have 3 ferry lines
Have 15 ferry lines
Have 3 monorail lines
Have 10 monorail lines
Transport 5 000 passengers with Cable Cars
Transport 20 000 passengers with Cable Cars
Have 3 blimp lines
Have 10 blimp lines
Have one Ferry and Bus Exchange Stop, Metro-Monorail-Train Hub, Monorail-Bus Hub and Multiplatform Train Station
Win all three Mass Transit scenarios
Produce all electricity without using raw materials
Have no polluting industry in your city, only Office Zone and specialized zones
Have all residential zone in your city be specialized Self-Sufficient Housing
Have all office zone in your city be specialized IT-Cluster
Have all commercial zone in your city be specialized Organic and Local Produce
Build one of each eco-friendly schools: Community School, Institute of Creative Arts and Modern Technology Institute
Have a maximum level park made with Park Tool
Have 10 parks made with Park Tool
Have a park with all zoo buildings built in it
Have 5 pedestrian Walking Tour lines
Have a Park Maintenance Service and a Zoo, Nature Reserve and Amusement Park in your city
Have a park with all Amusement Park buildings built in it
Have a park with all Nature Reserve buildings built in it
Have 15 Sightseeing Bus lines
Build one of each road Toll Booth buildings
Level up an Industry Area up to Level 5
Build 10 Industry Areas
Build five Oil Rigs
Build all Unique Factories
Deliver 1 000 000 units of Mail
Build 10 Warehouse buildings
Have total number of 10 Dormitories
Have 15 000 students studying on campuses at the same time
Have one campus reach "Prestigious" in reputation
Build all five varsity sports arenas on one campus in one city
Build all Campus Area types with all of their respective campus buildings and faculties
Create 100 academic works
Cover one campus area upkeep cost entirely with tuition fees paid by students in a campus area with more than 5000 students
Farm 7 500 000 units of fish and sea plants.
Catch 10 000 000 units of fish.
Build one of each of the following transport hubs: Underground Metro-Intercity Bus Hub, Bus-Intercity Bus Hub, Train-Metro Hub, Metropolitan Airport, Bus-Metro Hub
Transport 35 000 amount of citizens in trolleybuses.
Transport 15 000 amount of citizens in passenger helicopters.
Have 60 tourists visit the Aviation Club during one week.
Treat 20 000 000 m3 of waste water using the Inland Water Treatment Plants.
Have an airport area reach level 3.
Have 10 000 total passengers travel through an airport area.
Build an airport area with a terminal, a runway and an aircraft stand.
Build an airport area with an area of 25000 cells.
Set the airline ticket price slider to the maximum price.
Have 5 garbage service points reach their capacity limit.
Build 10 ice cream stand plazas in one pedestrian area.
Have one pedestrian area focused on residential, one in commercial, and one in workplace zones.
Earn ₡5,000,000 through investments.
Have at least ₡1,000,000 in cash. Put all of your money into investments, then don't sell any investments for one month.
Have a bank building get flooded.
Transport ₡2,000,000 using cash transport vans in one week.
Take a loan in order to make an investment.
Have total of 500 weekly guests to stay at hotels.
Organize three hotel events.
Have the maximum possible number of guests stay at any 5 star hotel with at least 100 rooms.