There are many difficult achievements in "Freeze Age 2", and Paradise City is one of them. To achieve this achievement, you only need to have a population of at least 15,000, and the city can continue to operate without any problems. 50 weeks is enough, any problem includes many problems.
How to get the achievement of Paradise City in Frostpunk 2
Paradise City
On the premise that the population reaches at least 15,000, the city can operate continuously for 50 weeks without any problems
Maintain a population of 15,000 for 50 weeks without any issues.
Chapter 3 of the story mode is the best time to try this, because the whiteout phenomenon will no longer occur, and other problems only need to be contained in advance