Deadly Premonition: The Director's Cut
60 Achievements
Steam
Periodic Riddle
Ushah has no idea what the answer is to Fiona's riddle. Figure it out and tell Ushah what the answer is.
3.5%
How to unlock the Periodic Riddle achievement in Deadly Premonition: The Director's Cut - Definitive Guide
Sidequest #10
Chapters Available: 4, 6-9, 11-16, 18 and 26
Requirements: None.
Sidequest Giver/Location: Ushah Johnson/Greenvale General Hospital
Reward: Trading Card #59
Unlocks: None
This is a very simple one, go to the hospital and speak to Ushah (downstairs at the computer where you first meet him). Choose the second option (Vertically) to complete the quest.