Here is the full list of all 42 Chronicle of Innsmouth achievements.
Chose a side.
Dodged the bombardment and escaped Innsmouth!
Solved the combination puzzle.
Ran away without a second look!
Escaped from the shoggoth.
Shot both Deep Ones.
Fell asleep to the soothing sound of the sea.
Watched cutscene.
Cthulhu ftaghn.
Killed by the smugglers.
Shadowed the lookout to the smugglers' lair.
Reached the top of the lighthouse.
Explored every last nook of Innsmouth.
Entered the refinery.
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.
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.
Spoke to Junior.
Got Melvin fired.
Found the YMCA.
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 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.
Never used the hotspot help option.
Looked at the gigantic skull several times.
Found all the letters.
Typed DAGON to solve the panel puzzle.