Here is the full list of all 27 428: Shibuya Scramble (JP) trophies - there are 8 bronze, 12 silver, 6 gold and 1 platinum.
Acquire all trophies
Finish the "True Conspiracy" scenario.
Finish the "Conspiracy" scenario.
Unlock all Special Episodes.
Finish the "Mean Clean" scenario.
Finish the "Suzune" scenario.
View the normal ending.
Finish the "Canaan" scenario.
View all bad endings.
View all bad endings in the 18:00 time block.
View the true ending.
View all bad endings in the 17:00 time block.
Clear the 17:00 time block.
View all bad endings in the 16:00 time block.
Clear the 16:00 time block.
View all bad endings in the 15:00 time block.
Clear the 15:00 time block.
View all bad endings in the 14:00 time block.
Clear the 14:00 time block.
View all bad endings in the 13:00 time block.
Clear the 13:00 time block.
View all bad endings in the 12:00 time block.
Clear the 12:00 time block.
View all bad endings in the 11:00 time block.
Clear the 11:00 time block.
View all bad endings in the 10:00 time block.
Clear the 10:00 time block.