Here is the full list of all 31 DARK achievements.
Killed 50 unaware opponents
Finished DARK on “easy”.
Finished DARK on “normal”.
Finished DARK on “hard”.
Rescued Rose.
Talked to Samantha at Headquarters
Rescued Tom.
Vampiric Powers used 50 times
Found 7 PDAs
Reached the ruins of Sanctuary
Distributed 20 Power points
Made it through the club area at the Atlantis
Distributed 10 Power points
Visited the Geoforge Parks
Used Shadow Leap 50 times
Subdued 5 opponents and Fed on them
You met Blooming in the museum catacombs.
Killed 50 opponents
Completed the Tutorial
You received your first blood – the first time is always something special …
Pursued Samantha.
Earned ten experience rewards for completing areas without raising the alarm.
Completed a level without raising an alarm
Learned all the powers and their upgrades.
Finished a challenge.
Finished a challenge in less than three minutes.
Finished a challenge without draining anyone.
Finished the Harding Museum in less than 20 minutes.
Died during the Tutorial … that IS bad.
Experienced the game in Virtual Reality.
Found the (not all that) secret announcement for a future project in the Tutorial.