Here is the full list of all 20 City Play achievements.
You have created two Animal Farms!
You have created two forresters!
Your City has opened its first Market!
Your City has a complex road system!
Your City has an advanced road system!
You have created a wood cutter!
Your City has a basic road system!
City population: 50!
City population: 100!
City population: 150!
You have a School District!
Your City has a Health System!
Your City is more secure!
Your City has its City Hall!
City population: 250!
City population: 400!
Your City is Green!
City population: 600!
Big City Cultural Life!
Your City is a Metropolis: 1000!