Here is the full list of all 16 Hektor achievements.
Get killed by the Predator more than 3 times.
Get screamed at by the Ghast 3 times.
Collect all the meatball cans.
Collect all notes in a single playthrough.
Complete game without using the Lighter or the Flashlight.
Get hit by the Predator 5 times without dying.
Pull the Lever in the wrong direction 5 times.
Get strangled by the sniper more than once in Dream II.
Complete the game in under one hour.
Turn off the water in under 1 minute in Dream I.
Complete the game without taking any damage.
Remain in constant motion for 5 minutes.
Play through the whole game without consuming any drugs.
Play thourgh the whole game without using any batteries.
Consume 100 pills.
Pick up 100 items.