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