Here is the full list of all 21 Keeplanet achievements.
Protect the first planet.
Raw recruit. Complete tutorial.
Protect oneself from a meteor for the first time.
Protect oneself from the alien attack for the first time.
Protect oneself from the swarm for the first time.
For the first time protect yourself from pirates.
Come throught the first system.
Come throught the second system.
Come throught the third system.
Complete campaign.
Build 1000 objects.
Build 5000 objects.
Build 10 000 objects.
Survive 20 threat.
Survive 50 threat.
Survive 100 threat.
Raise the population to 5000 people.
Survive 10 minutes in endless mode.
Go strong! Continue the game after 1 defeat.
Build 50 shields, mountains, trees, drones, guns, generators.
Build 5 mountains, 10 shields and 20 trees on one planet.