I highly recommend that you play through the entire game at least once before you look at this guide!! Please spare yourself the spoilers and try to play this great game blind ^^ Ty for looking at this guide, hope it helps!!
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The first major route divergence is in Chapter 2 Part 1, in which either Alice Yabusame or Reko Yabusame will die. Your actions decide this in a more indirect way than the other routes.

During the final attraction, if you decide to push off the fake Reko into the spikes, the result is Alice dying. If you either decide *not* to push the fake Reko, or run out of time, the result is Reko dying. If you're having trouble getting either of these, I'll put vgpersons original walkthrough to this part below.

Choose Nao's topic.

Talk to Reko and choose "a trick in the room." Talk to Nao. Contrast Reko and Nao's statements.

Talk to Reko and choose "person." Talk to Nao and choose "weight." Contrast Reko and Nao's statements.

Talk to Reko. Talk to Nao and choose "the high-placers aren't here." Contrast Reko and Nao's statements. Touch the floor tile one back and left from where Reko is standing.

Talk to Reko. Talk to Nao. Contrast Reko and Nao's statements.

Present the Web of Happiness to Keiji.

Talk to Nao, ask for details, and ask for Keiji's statement. Contrast Reko and Keiji's statements.

Talk to Kanna. Talk to Sou and pick Ranger. Contrast Kanna and Sou's statements.

Present the Web of Happiness to Sou.

In the war of words, the correct statements to object to are "I've been with Alice," "split the stuff equally," any of the three, "Ranger's word games," and "ain't that everybody?" But actually, how many you answered correctly has no impact.

Talk to Reko and choose "sing a song." Present the Band Breakup Article to Reko.

(If you don't run out of time, but don't want to push the fake Reko into the spikes, simply right click.)

(PS: if you have Alice die, and you've done the bongos side quest, there will be some different dialogue. I recommend trying to see it for yourself.)

The second major route difference is in Chapter 2 Part 2, in which either Kanna Kizuchi or Sou Hiyori can die. This is one of the more direct route changes, as you get to actually choose.

The divergence happens in the 2nd main game, and all you need to do is get through it, no need to pick different dialogue options depending on route you wanna do. The moment when you get to choose between the 2 is near the end, during the final vote. I'll put vgpersons walkthrough for the 2nd main game below.

Choose Keiji's topic.

View Sou's statement, and Kanna's face will change while it's up - click on her. Succeed at the minigame. (Failing loses you Clout, but with each failure, it gets easier to succeed.)

Talk to Kanna. Talk to Nao. Contrast Kanna and Nao's statements.

Talk to Q-taro. Present the 1F Security Footage to him.

Talk to Sou. Present the Stun Gun to him.

Talk to Nao. Either present the Victim Video to Nao, or talk to Gin too and contrast Gin and Nao's statements.

In the war of words, you need at least 3 rebuttals to win favor. The correct statements to object to are "everybody knows it," "saw it alone," "no good to suspect," "no difference," and "no relation." If you succeed, the following scene offers more detail, but that's about it.

Talk to Sou. View his new statement, and click on Q-taro's face.

Talk to Gin. Contrast Gin and Q-taro's statements.

Talk to Reko/Alice. View their new statement, and click on Q-taro's face. Succeed at the minigame.

In the Balance Battle, affirm Keiji's "Q-taro couldn't," affirm Sou's "just take a peek," affirm Keiji's "started to negotiate," deny Keiji's "must've let him in," and affirm Keiji's "slipped the tablet under."

Talk to Q-taro. Talk to Gin. Contrast Q-taro and Gin's statements; this will change Sou's statement. Talk to Keiji, and contrast Keiji and Sou's statements.

Talk to Q-taro. Present the Tablet to Q-taro.

Talk to Gin. Contrast Gin and Keiji's statements.

Talk to Kanna and question her. Talk to Gin. Contrast Kanna and Gin's statements.

Talk to Kanna.

Talk to Q-taro. Talk to Nao. Contrast Q-taro and Nao's statements.

Talk to Kanna and say "there isn't." Present the Four Papers to Kanna.

Talk to Gin. Talk to Sou. Contrast Gin and Sou's statements.

View Sou's statement and click on Keiji's face. Succeed at the minigame.

Talk to Sou. Talk to Nao. Contrast Sou and Nao's statements.

Talk to Sou. Talk to Kanna. Contrast Sou and Kanna's statements.

Vote for Sou if you want to Kanna to live/go on the emotion route, and vote Kanna if you want Sou to live/go on the logic route.

(You can also vote for Nao, which gets you an ending. (its pretty interesting, so I recommend trying to see it!))

A not very impactful diversion (as of yet at least), but still there, are the dummies! If you lose the obstructer fights, all the dummies except for Hinako can die before the Banquet. However, if you have them alive, Hayasaka, Mai, or Kurumada can actually survive the Banquet! This all depends on which coffins you choose to drill. (While some of the dummies, like Anzu and Hayasaka may not have much plot significance, I'd still recommend trying to keep all of them alive, as they are neat characters and have some interesting dialouge.)

The first coffin you use a hint on will contain Hayasaka no matter what, so if you drill that one, he dies.

The second coffin you use a hint on will contain Mai no matter what, so if you drill that one, she dies.

The coffins you dont use a hint on will always contain Kurumada, so if you decide to drill one of those, he dies.

(Sadly, the rest of the dummies are guaranteed to die during the Banquet.)

I'll put vgpersons walkthrough to the Banquet below, in case you need it.

Select Q-taro's topic. (You can select Sou/Kanna's topic first, but it won't really lead anywhere just yet.) Present the Lantern to the person who speaks up.

Section 1: Mystery of the Glowing Coffins
Talk to Anzu/Hinako and answer "five." Talk to Q-taro. Contrast those two statements.

Section 2: The Coffins' Lost Glow
Talk to Ranmaru/Hinako (if the latter, she needs to be pressed). Contrast their statement with Kurumada/Gin's.

Section 3: Who Painted the Coffins When?
Talk to Gin. Talk to Reko/Alice/Q-taro. Contrast those two statements.

Section 4: Using the Machine / Using the Hint
Touch the lower part of the platform with the numbers and circles. Select any of the glowing coffins.

Section 5: The Red Lamp's Meaning
Present the Note to Kanna/Sou.

Section 6: Who's the Human?
Talk to Hinako. Present the ID Card to Hinako.

Section 7: Mai's Fingerprint Scan
Talk to Mai/Q-taro and ask if they have any ideas. Talk to Hayasaka/Gin. Contrast those two statements.

Section 8: Defeat Midori
Select one of the glowing coffins. (Spoiler about exact outcomes: Hayasaka will be hit if you pick the coffin with the hint. Kurumada will be hit if you pick a different one.)

Section 9: Midori's Selection
Talk to Midori.

Section 10: Hinako's Blue Lamp
Talk to Gin. Talk to Ranmaru/Q-taro. Contrast those two statements.

Section 11: About Hinako
Talk to Q-taro, pick "the gallery," then present the Lantern to him. Select the painting of the black-haired girl surrounded by blood. Talk to Reko/Alice/Gin. Contrast the two statements.

Section 12: Connection to Hinako
Talk to Reko/Alice/Q-taro. Present the Voice Recorder.

Section 13: The Third Hint
Select one of the glowing coffins that doesn't already have a hint and hasn't been hit. For the target, select either that same coffin, or the first hint coffin if you didn't hit it already. Select another glowing coffin with no hint.

Section 14: Final Gamble
Talk to Q-taro. Talk to Gin. Contrast those statements. Talk to Q-taro again. Use the Lantern on Q-taro and select the final line. Talk to Kanna/Sou. Contrast that statement with Q-taro.

Section 15: The Three Non-Glowing Coffins
Talk to everyone.

Section 16: The Final Hint
Select one of the non-glowing coffins (not the destroyed one). For the target, select one of the two non-glowing coffins other than the one chosen for the hint.

In the war of words, object to "no way Keiji's inside," "dying moments," "maybe Shin," "the type of collar," and "my collar."

That concludes this guide! I hope this helped you in some way. ^^ I'll probably update this when the full game comes out. If you have any suggestions of things I should add to this guide, feel free to put it in the comments! This is my first guide, so take my guide-writing skills lightly.