Lost Judgment

Complete 30 of the 42 available side cases (DLC side cases and girlfriend stories do not count). Some are story-related, and other ones open up in Chapter 3. The rest are attached to Girls' Bar and the Emily girlfriend questline.

If you complete all the side cases as they come up, you can unlock this before the end of chapter 4.

Here are the first 30 it's possible to complete, in (roughly) the order you can get them. You can check your progress on the 'Case file' app, under 'side cases'. The number next to each is where they are in that list.

Chapter 1

#1. Skateboard Detective vs. the Reseller (unmissable story-related story)

Chapter 3

• #2. The Falling Man (unmissable story-related story)
• #3. The Café Robber
• #5. Where is the Time Capsule?
• #7. The SRC's Hunt for the Truth
• #8. The Invisible Burglar (need Buzz Researcher keyword ‘stalker’)
• '9. The Body Model Walks at Night!!! (need Buzz Researcher keyword ‘body model’)
• #10. Dueling Dojos (get from the Kamurocho detective agency board, where it’s called ‘The Saga Continues: Ryan's Rival Appears!’)
• #11. The Forbidden Taste (get from Yokohama detective agency board)
• #12. Paradise VR Unlocked!
• #13. Paradise VR Upgraded! (must have completed Paradise VR Unlocked! - needs a lot of Play Passes)
• #14. Let the Drones Fly!
• #15. Extracting the Past (unmissable story-related case)
• #16. Extracting the Truth (must have completed Extracting the Past)

Chapter 4

• #4. Trying the Patience of a Saint
• #21. Dastardly Detective: Introduction (unmissable story-related case)
• #22. Dastardly Detective: The Wandering Bug (need Buzz Researcher keyword ‘noise’)
• #23. Dastardly Detective: Grasping Attention (must have completed ‘The Wandering Bug’)
• #24. Dastardly Detective: Before the Torch Burns Out (must have completed ‘Grasping Attention)
• #35. Between Blood and Booze (part of Girls’ Bar, unlocks once you get detector and have School Stories appeal level 4)
• #36. Big Shame Hunter (part of Girls’ Bar)
• #37. Random Fandom (part of Girls’ Bar)
• #38. Step By Step (part of Emily S. Mochizuki’s girlfriend quest, which unlocks when you complete Girls’ Bar)
• #39. Broken Barriers (part of Emily S. Mochizuki’s girlfriend quest)
• #40. We Mend, We Grow (part of Emily S. Mochizuki’s girlfriend quest)
• #17. A New Partner? (unmissable story-related case)
• #6. Where the Kappa Roam
• #19. Flight of the Game Creator (get from Yokohama detective agency board, where it’s called ‘Our Runaway Game Director!’)
• #20. A Particularly Hardcore Demo Event (must have completed ‘Flight of the Game Creator’)
• #18. Chaos of the Masked Writer (get from Yokohama detective agency board, where it’s called ‘Please Investigate a Corporate Spy’)

For a full list of side cases, including how to unlock and complete them, see CyricZ’s excellent guide on GameFAQs:
https://gamefaqs.gamespot.com/ps4/320117-lost-judgment/faqs/...