Here is the full list of all 20 Cliff Empire achievements.
Reach 7000 population on Earth
Defrost 2000 people
The explosion of the nuclear power plant
Survive 20 waves of Marauders
Complete 100% of all researches
Fly by personal transport when all your cities have a 1000000¢ in total
More agrarian drones count than ordinary
Reach 200 newborn on Earth
Get up by elevator of entertainment center
Complete 50% of all researches
Earn 50000¢
Complete 25% of all researches
Critically low ecology
Save 20 buildings from fire
Fully load trading barge
Destroy 10 buildings in a row
The moment when two warehouses arrive at once
Build 10 buildings at once