Here is the full list of all 22 Aethernaut achievements.
Complete the tutorial
Get half of the aether vials to open the core
Get all of the aether vials to open the core
Get all of the aether vials
Find half of the recordings
Find all of the recordings
Play the game in one sitting and complete the last puzzle in under 3 hours.
End the game with a light cube
End the game with a shadow cube
End the game with a time cube
End the game through the side path
End the game too early
End the game with an orange cube
Complete the final puzzle room with no aether vials
Complete Up on the edge under 15 seconds, without using Solve puzzle
Complete Underground Pyramid under 25 seconds, without using Solve puzzle
Vote neutral on every question
Use the Solve puzzle feature
Mantle 250 times
Walk 5 kilometers
Spend over 20 minutes in the same puzzle
Fall for over 40 meters