Here is the full list of all 14 Heliopedia achievements.
Make a lightning storm.
Make fire.
Make a planet.
Make a volcano.
Make a black hole.
Beat the game.
Find all 11 main biomes.
Find all 17 plant species.
Find all 15 types of critters.
Find all 15 kinds of trees.
Find all 17 animals.
Find all 11 inventions.
Complete the Heliopedia.
Find all 13 materials.