There are 242 collectibles in this game. If fetching them all is your idea of a fun speedrun, have at it. The moderator for this game isn't very active (look at the any% WR to see how long it took to get verified) so I wouldn't expect to see it get added to the site any time. Probably the reason it wasn't put there in the first place is because it sounds like a really boring run.
We would also need to define what the 100% run is. Obviously (or, I think obviously) all collectibles would be required. What about NPC dialog? Side cases? Demon kills? There's one investigation in the main story that's optional, is that required? Do you have to pick up every clue in every investigation, or just the relevant ones?
I'm gonna say these are the 100% rules:
All collectibles All investigations All clues in all investigations
The game doesn't track demon kills or certain interactive nodes that aren't considered collectibles. But everything that's shown tracked on the select-menu screen, gotta catch 'em all.
What do we think? I'll go ahead and make the category with these rules, we can revise if needed.
Change: You are now allowed to remove the 5 splash screens, that plays when booting up the game, in the Cutscenes subcategory. It's optional, so if you wish to not do that I will simply retime those runs and remove the exact time needed.
Reason: For the people who resets the game twic
