Here is the full list of all 22 Megapolis achievements.
Reach 25 total happiness.
Upgrade 100 buildings.
Build 75 buildings.
Demolish 25 buildings.
Upgrade 25 buildings.
Demolish 5 buildings.
Build 10 buildings.
Build 250 buildings.
Upgrade 300 buildings.
Demolish 100 buildings.
Clear 75 plots.
Earn $100,000,000.
Order 150,000 units of material.
Train 100 workers.
Buy 20 licenses.
Build a zone with 5,000 residents.
Win 12 sandbox scenarios.
Earn 12 gold stars.
Earn all the gold stars.
Earn 12 trophies.
Earn all the trophies.
Complete the entire campaign.