Here is the full list of all 30 Darkness Within 1: In Pursuit of Loath Nolder achievements.
Take the medallion with the symbol of Howard's family
Solve the 5 disc puzzle in the William Poer's crypt.
Find the old cemetery in Windlapse.
Hear some strange noises on your answering machine.
Find the true intention of your friend Arthur.
Find out what has happened to Mr. Braunbell.
Discover whether the police are involved with the cult.
Sovle the puzzle on the sealed underneath the Braunbell's Mansion.
Click 5 times on an animal that Edgar Allen Poe wrote a poem about, to reveal it.
Discover the location of M.r. Braunbell's Mansion.
Solve the ring puzzle in the wall of sleep nightmare.
Solve the statue puzzle in Clark Field's library.
Solve the map machine puzzle.
Find out a new major lead using the clues that is in the letters in ivar's cabin.
Solve the didgeridoo puzzle in the mushroom cult cave.
Speak with the person who introduces himself as Loath Nolder.
Persuade the Strange Man that you are the one he thinks you are.
Discover that you slept for 2 days.
Knock knock, look at the clock.
Solve the cogwheel puzzle in the second nightmare.
Solve the scheduler puzzle.
Dates that Lovecraft himself probably wouldn't have put in an organizer, will reveal something.
Find a hint in the first nightmare regarding your dual personality.
Find a way to examine the well in the Clark Field's mansion.
Solve the locked case puzzle in the library of Clark Field's mansion.
Find the Christopher T. Dreaden hidden thought.
Find Clark Field's address.
Discover what has been altered in Loath Nolder's office.
Discover that the answering machine has no new messages, despite Arthur urging you to check.
Discover that Loath Nolder escaped from hospital last night.