So you think you beat the game huh? Since you got 100% achievements and have gotten the final ending, well perhaps yes you did beat the game, but there is more.
All you need to figure out this last bit though is the true ending of the game, anyways I wanted to divulge a little secret I found. Here's the steps to find it. Spoilers below BTW.

Step one: Get to chapter 2, at this point you should be able to skip just about everything in the game so it shouldn't take you too long.

Step two: Skip the very first part of the day until you get to the part where you are choosing whether to visit the grocery store production facility etc. When here choose to Visit the Tatsu Park

Step three: When in the park go look at the map and select to go North, towards Tatsu Avenue. At this point you may be able to guess the next step.

Step four: Open the hatch, Turn lever counter-clockwise, push first button, press second button. Normally there is a bloody bandage here, but this time! What is this a strange looking orb of Darkness. Don't be afraid! Go on ahead and Touch it. Your gonna think the game crashed for a second this is when things get crazy.

Step five: The Remy section should be skippable if not, read through it of course. This should seem like your first play-through, I don't believe the choice is really relevant to this part but I usually click that I felt the responsibility placed on my shoulders.

Step six: New part, this will be unskippable so get ready for some extra reading. Read all the way up till you get to your next choices.

Step seven: Play Tennis, which is literally pong, currently that is the only thing you can properly do, you can check your egg count if you want. You have to beat the AI.

Step eight: Congratz on winning pong, you should now have a new option on the list called Af %2035sc @ctions. This part is where without this guide you'd be doing a lot of restarting.

Step nine: Press these actions, I don't believe they have to be in order but just follow this list just incase.
1: Af %2035sc @ctions 2 (Unlocks files somewhere for you)
2: Af %2035sc @ctions 13 (Unlocks Developer tools)

Step 10: Below are some passwords and search terms you can enter, most of the main cast names you search in the database will say {database corrupted} then give you a letter, these letters were used to make up the word Count Cards.

Searchable words:
Pavilion -PW Free
CTT - PW Free
Isabel - PW Free
STS - PW Free
Metropolis - PW is bastion
Sebastian - PW is handcuffs
Kevin - PW is college
Adine - PW is sandcastle
Anna - PW is slide
Bryce - PW is bloodstain
Lorem - PW ixomen sphere
Emera - PW is politician
Katsuharu - PW is ice cream
Remy - PW is books
Zhong - PW is gentleman
Talisman - PW is correcthorsebatterystaple
Marcus - PW is end times - This one changes outcomes in the game.

Developer tools PW is cHeWiNg gUm