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