Here is the full list of all 23 The Innsmouth Case achievements.
Played through all endings
Mentioned your vegan lifestyle 3 times
Traumatized Evelyn
Saved from the stake
Pissed Dahlia off to death
Dahlia spared your life
Discovered all of Innsmouth
Slept with Priscilla
Wrongdoings have consequences
Snooped through the Marsh Family records
Became friends with Jonah
Played a creepy Arcade Game
Overpowered the gawper
Snooped through an abandoned hotel room
Used dirty methods to avoid payment
Wendy found a safe place
Spent a night with Dahlia
Found a couple of weird City Hall records
Seduced Ethel
Slept with a fish creature
Didn’t touch the cube in the lighthouse
Survived a night in the Gilman Hotel
Discovered fragments from Innsmouth’s history