Opened the cryotube door.

Collected the camera.

Collected the Golden Record.

Finished watching the credits.

Inputted the password without collecting any clues or walking through any doors.

Collected all clues without triggering the repeating rooms.

Solved the password.

Walked through fire.

Finished one complete playthrough.

Experienced all possible scares.

Took pictures of every interactable moon symbol.