Here is the full list of all 22 Megapolis achievements.
Reach 25 total happiness.
Upgrade 300 buildings.
Demolish 100 buildings.
Buy 20 licenses.
Clear 75 plots.
Train 100 workers.
Build 75 buildings.
Upgrade 100 buildings.
Demolish 25 buildings.
Upgrade 25 buildings.
Demolish 5 buildings.
Build 10 buildings.
Build 250 buildings.
Earn $100,000,000.
Order 150,000 units of material.
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.