Here is the full list of all 32 Seabed Prelude achievements.
Scan every scannable item in the Casino Station.
Scan the documents.
Scan the painting and the second notebook.
Collect everything necessary for the fuel formula.
Scan every scannable item in the game.
Scan every scannable item in the first Dome.
Start your journey.
Scan the button under the Boss's table.
Crash the bathyscaphe.
Beat the game.
Hit every note on the highest speed.
Hit every but one note.
Try to see yourself in the mirror.
Scan PC with the algae.
Scan the PC with the Constructors' symbol.
Scan the tank with the algae samples.
Scan the first notebook.
Scan the gigantic scroll.
Scan the second notebook.
Scan the painting.
Scan the radioactive barrel.
Scan every dome miniature.
Scan every scannable item in the Bedsit Station.
Scan every scannable item in the Storage Station.
Scan every scannable item in the second Dome.
Scan every scannable item in the Office Station.
Scan every scannable item in the Gallery Station.
Scan every scannable item in the Factory Station.
Scan every scannable item in the Constructor's home.
Scan every scannable item in the Depot Station.
Scan every scannable item in the Conference Station.
Scan every scannable item in the third Dome.