How do I unlock all achievements?

To unlock the first one, simply place down a star. The second one is that you need to collide a star or planet with another star or planet. The third one is pretty random. You need to collide a bunch of Moons together, then ahead of time, make a nebula(collide stars with each other), and make the remaining Moon go into it and become a gas giant. The fourth one is to collide a Lava Planet and an Ice planet. The fifth one is to create life. You can easily do this by locking a Terrestrial Planet in the habitable zone. Then the sixth one is to collide a planet with life on it with anything. The seventh is to freeze a planet with life, with the eight being the opposite(burn a planet with life). The ninth is where you gotta go away from the center of the universe. The tenth is make a solar system with 7 or more planets(but it's still pretty hard).

TL;DR

1 = Make First Star

2 = Collision

3 = Moons collide, then become gas giant

4 = Collide Ice and Lava

5 = Make Life

6 = Destroy Life with anything

7 = Destroy Life with freeze

8 = Destroy Life with fire

9 = Go very far away from center

10 = Make large solar system