Here is the full list of all 22 Megapolis achievements.
Reach 25 total happiness.
Buy 20 licenses.
Build 75 buildings.
Train 100 workers.
Upgrade 100 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.
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.