Call Of Cthulhu: Dark Corners Of The Earth - Hardened Detective difficulty

Mythos Master difficulty:
Successfully complete the game under the Hardened Detective difficulty setting.

"A" rank:
Get a 100 game completion to earn an "A" rank. This can be done by collecting all journal entries thirteen in Jack's Diary, eighteen in General Evidence, and six in Mythos Tomes, finding the rifle a reception office door in the refinery, saving Ruth from the rafters, and keeping enough sailors alive during the boat ambush all under three and a half hours with less than thirty saves done manually.

Craig Mullins gallery:
Successfully complete the game under the Hardened Detective difficulty setting.

Background art renders:
Successfully complete the game under the Private Investigator difficulty setting.

Character art renders:
Successfully complete the game under the Private Investigator difficulty setting.

Concept artwork:
Successfully complete the game under the Private Investigator difficulty setting.

Variety Store: Safe combination
The combination to the safe in the Variety Store is 2-6-1-2.