Here is the full list of all 17 DARQ achievements.
The base game contains 8 achievements, and there are 2 DLC packs containing 9 achievements.
Finish the game after all dream journal pages have been collected.
Finish the game
Find Dream Journal Page in the hospital
Find Dream Journal Page while on the train
Find Dream Journal Page in the theater
Find Dream Journal Page in the city
Find Dream Journal Page in the subway station
Find Dream Journal Page while trying to solve the gear puzzle
Solve the rotating camera puzzle before the camera completes the first rotation.
Complete "The Tower" DLC under 6 minutes
Complete the pyramid stacking puzzle in "The Tower" with the least amount of moves required.
Trigger 3 secret encounters with the bag-headed boy. They are well hidden.
Complete "The Crypt" DLC under 12 minutes
Complete the scissors puzzle in "The Crypt" within 15 seconds or less.
Find 3 quartz skulls in "The Crypt"
Find all skulls in "The Crypt"
Find the diamond skull in "The Crypt"