Here is the full list of all 14 Dark Passenger achievements.
Die of a panic attack
Trip into all three breakable objects in the starting area
Poke the sleeping guard in level 2
Get caught by a secretary in level 3
Wait long enough for the patrolling guards to stop patrolling in level 4
Die in a to a collapse, by gravity or die in a fire in level 5... or maybe take a little shock
Tried to get back into the starting area in level 6
Met the local in level 7
Get educated in level 7
Met a Japanese Warrior in level 9
Met the chav in level 12
Got too intimate with an equine in level 13
Got killed by a boar...
Obtained a real achievement! Hurray!