The Innsmouth Case

There are 27 endings in total in The Innsmouth Case, and this trophy will take up the majority of your playing time.  Some of the endings have multiple ways to unlock, but others are well hidden and only have one path.  I have covered all of them in my walkthrough.

Page 1:

Let's call it a day! - refuse to take the case.
Slashed! - lose the fight against the peeping stranger at the fountain in the city centre.
Demon Barber - get a haircut at the barber when you are already bald.
Shot - at dinner, decline the wine, wait for the food, then try to flee the manor.
At the Stake - at night, get caught by the townsfolk and fail to escape.
A Sacrifice to the Gods - survive the dream at the Gilman Hotel, then try to flee.
Madness - you need to encounter at least two strange occurances (the screen will shake) and then leave the town.  The easiest way to accomplish this is to read the newspaper only once while on the bus (the people will stare at you once you put the paper down), and climbing the lighthouse and staring deeply at the cube before leaving (do not touch the cube).  Theoretically, looking at the picture in the Gilman Hotel and staying awake the entire night is supposed to work (per the devs), but I wasn't able to get the trophy to unlock by using that instance.
Blood on your hands - you need to witness at least one strange occurance (the screen will shake), and then sacrifice Lonny and Kate at the end of the game.  The easiest path to this ending is to read the paper only once on the bus, then get caught at the police station to be taken to the sacrificial area, argue with Gary and take over the ritual.

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Strangled - be rude to the old man at dinner, and fail to fight back.
Rabid Ferrets - at night in the town alleys, meet up with Ethel, ask for a place to stay for the night, agree to help, and look in the bag when she leaves.
The Song of the Sea - go on the wellness retreat (via the hotel), but do not climb on top of the cage.
Buried Alive - at night in the town alleys, meet up with Ethel, ask for a place to stay for the night, agree to help, then change your mind.
Just married - be on great terms with Dahlia by the time you get to dinner (i.e. be playing a game where you've unlocked One Night Stand ).  Sleep with her at dinner, propose to her (I did this in the attic, but it's probably fine if you do it at the dinner table), then sacrifice Lonny at the end of the game.
I regret nothing - at the Wet Grotto brothel, choose Don, then read the text he offers.
Wellness! - sign up for the wellness retreat at the hotel, and survive it by climbing onto the top of the cage.  You will unlock Survivor   while going for this ending.
Transformation - be on great terms with Dahlia by the time you get to dinner (i.e. be playing a game where you've unlocked One Night Stand ).  Sleep with her at dinner, say you're a lone wolf, then notice the gun and try to escape.  Once in the attic, bargain with Dahlia, confess your love, and tell her that nothing needs to happen tonight.  Free yourself and fire a warning shot at the villagers.

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Yith we can! - climb to the top of the lighthouse, look closely at the cube, then pick it up.
It's the New Economy, stupid! - go to the arcade and watch the entirety of the opening of Maison of the Unliving.  Take the girl to the address Dahlia gave you (do not listen to the young girl), wait a half an hour at the address, get caught by the villagers, go berserk with Gary, and explain the basics of modern management theory to the villagers.
A bad feeling - you need to figure out what's going on in Innsmouth, then leave without fully solving the case.  There are plenty of ways to do this, and you're likely to get this without trying.
Nightmare - refuse to look at the thing chasing you during your nightmare at the hotel
Black Widow - be sacrificed by Dahlia in the attic of the Marsh Mansion
Sinking Feeling - you need to drown in the sacrificial cave.  Get possession of the dagger and throw it into the abyss.  You can also get pushed in by Dahlia.
Final Destination - you first need to successfully beat up the creepy guy watching the tourists at the fountain, and look through his wallet.  Then waste time until night so you can't get into the hotel and find yourself wandering around the alleys.  When you see the townsfolk, cover your face, claim to be Isaac (the guy you beat up earlier) and that you're just going for a walk.  At the outskirts of town, keep walking/running until you have a heart attack.
Broken Chains - First, unlock BFFs .  Then get arrested at the police station, and when you're visited in the cell, attack the officer.   Ask for help, ask Jonah to join you, and escape via the sewers.

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Sleeping with the Fishes - at the Wet Grotto brothel, choose to sleep with Coy.
Innocence - you need to leave Innsmouth without figuring out what's going on.  The easiest way to accomplish this is to waste time around town, go to the beach and take a deckchair away from other people, ignore the beach activity, spend the night with Ethel, and leave.
Dagon's Embrace - get sacrificed by Gary.