Here is the full list of all 22 Townopolis achievements.
Earn all the gold stars.
Earn 12 silver or gold stars.
Earn all the trophies.
Complete the entire campaign.
Upgrade 300 buildings.
Reach 100 total happiness.
Build 250 buildings.
Upgrade 100 buildings.
Earn $100,000,000.
Order 300,000 units of material.
Build a town with 1,000 residents.
Win 12 sandbox scenarios.
Upgrade 25 buildings.
Buy 30 licenses.
Earn 10 trophies.
Demolish 50 buildings.
Build 75 buildings.
Train 100 workers.
Demolish 10 buildings.
Clear 50 plots.
Build 10 buildings.
Demolish 2 buildings.