Here is the full list of all 28 Ratopia Playtest achievements.
settlement of migrants in the city
assignment of jobs to citizens
Override a new policy
New Blueprint Research
a civil burial in a grave
a rest in the royal bed
Enable escort command
activation of the temple
construction of decorative buildings
the construction of a railroad in a city
Set up a group of citizens
Discovery of neighboring cities
purchase of loan products
the conclusion of a trade agreement
springing
a summer vacation
Falling out in autumn
a winter break
the emergence of middle-class citizens
the emergence of high-class citizens
Prosperity Level 4 Reached
Destruction of the Plague Mouse Tomb
the construction of a monument to a supermassive monument
Maintain 50 middle-class citizens for 12 days
Maintain 50 high-class citizens for 12 days
Surviving the difficulty level for a year
Pia 99,999 secured