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