Here is the full list of all 42 Chronicle of Innsmouth achievements.
Watched cutscene.
Cthulhu ftaghn.
Killed by the smugglers.
Shadowed the lookout to the smugglers' lair.
Reached the top of the lighthouse.
Entered the refinery.
Explored every last nook of Innsmouth.
Showed the article about Melvin in the paper.
Learned about "The Innsmouth Look".
Arrived in Innsmouth.
Witnessed a brutal beating.
Gave the train model to the train geek.
Asked everyone for a working pen.
Swapped the pen for the train model.
Solved the tiara puzzle.
Crashed the game by asking too many questions about the mirror.
Read every book from the library.
Got Melvin fired.
Saw Andrew Hopelow dancing to the Whateley Hillbillies' music.
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.
Kicked out by Madame Tilton.
Distracted by a classic quote.
Began the game for the first time.
Looked at the short man.
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.
Solved the combination puzzle.
Chose a side.
Never used the hotspot help option.
Shot both Deep Ones.
Looked at the gigantic skull several times.
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.