Here is the full list of all 31 DARK achievements.
Completed the Tutorial
You received your first blood – the first time is always something special …
You met Blooming in the museum catacombs.
Visited the Geoforge Parks
Made it through the club area at the Atlantis
Reached the ruins of Sanctuary
Talked to Samantha at Headquarters
Pursued Samantha.
Rescued Rose.
Rescued Tom.
Used Shadow Leap 50 times
Killed 50 unaware opponents
Subdued 5 opponents and Fed on them
Earned ten experience rewards for completing areas without raising the alarm.
Killed 50 opponents
Vampiric Powers used 50 times
Distributed 10 Power points
Distributed 20 Power points
Found 7 PDAs
Completed a level without raising an alarm
Learned all the powers and their upgrades.
Finished DARK on “easy”.
Finished DARK on “normal”.
Finished DARK on “hard”.
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.