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 true intention of your friend Arthur.
Discover whether the police are involved with the cult.
Find the old cemetery in Windlapse.
Sovle the puzzle on the sealed underneath the Braunbell's Mansion.
Hear some strange noises on your answering machine.
Click 5 times on an animal that Edgar Allen Poe wrote a poem about, to reveal it.
Find out what has happened to Mr. Braunbell.
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.
Dates that Lovecraft himself probably wouldn't have put in an organizer, will reveal something.
Knock knock, look at the clock.
Find a hint in the first nightmare regarding your dual personality.
Discover that you slept for 2 days.
Solve the cogwheel puzzle in the second nightmare.
Solve the scheduler puzzle.
Solve the locked case puzzle in the library of Clark Field's mansion.
Find a way to examine the well in the 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.