Here is the full list of all 42 Chronicle of Innsmouth achievements.
Arrived in Innsmouth.
Witnessed a brutal beating.
Gave the train model to the train geek.
Swapped the pen for the train model.
Solved the tiara puzzle.
Read every book from the library.
Got Melvin fired.
Kicked out by Madame Tilton.
Spoke to Junior.
Found the YMCA.
Found all the letters.
Saw the young librarian in his Ace Of Spades era.
Met the shady thug for the first time.
Distracted by a classic quote.
Began the game for the first time.
Showed the article about Melvin in the paper.
Looked at the short man.
Asked everyone for a working pen.
Asked the barman for advice.
Read the spine of every book in the library.
Slipped on a Freudian phallic symbol peel.
Said all the fake names for Andrew Hopelow.
Saw Andrew Hopelow dancing to the Whateley Hillbillies' music.
Solved the combination puzzle.
Crashed the game by asking too many questions about the mirror.
Learned about "The Innsmouth Look".
Explored every last nook of Innsmouth.
Entered the refinery.
Killed by the smugglers.
Chose a side.
Never used the hotspot help option.
Watched cutscene.
Shot both Deep Ones.
Shadowed the lookout to the smugglers' lair.
Looked at the gigantic skull several times.
Cthulhu ftaghn.
Reached the top of the lighthouse.
Fell asleep to the soothing sound of the sea.
Ran away without a second look!
Escaped from the shoggoth.
Dodged the bombardment and escaped Innsmouth!
Typed DAGON to solve the panel puzzle.