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