890B (HP)

After walking into the Calculus lab (section 3 achievement) go back downstairs, through the atrium, and into the first room to talk to Luna, to update objectives. Go back to the calculus, then pick up the laptop by interacting with the floating white cube, then go back to Luna by walking into the white cube in front of her
*note: im assuming here you had to trigger all boxes on 2nd floor first before luna will ask for her laptop, because i didnt bother going back downstairs beforehand.*

Section 1: 0:45
Section 2: 0:55
Section 3: 1:45
Section 4: 3:05
Section 5: 7:20
Section 6: 14:50
Section 7: 17:05
Section 8: 22:40
Section 9: 22:55
Section 10: 26:30

Achievement Walkthrough: