Here is the full list of all 11 890B achievements worth 1,000 gamerscore. It takes around 0.5-1 hour to unlock all of the achievements on Xbox One.
Talk to Luna
Explore the atrium
Find the calculus lab
Bring Luna her laptop
Restore the power
Open the door to the observatory
Find the electronic board in the atrium
Hack the board
Reach the lens in Luna's office
Compile the script in the observatory
End the game