Here is the full list of all 16 Dracula's Legacy achievements. It takes around 2-3 hours to unlock all of the achievements on Windows.
You managed to get rid of both twins.
You found a secret passage in the fountain.
You've got the gift of Dracula.
You didn't skip any single puzzle.
You didn't miss any single video or dialogue
You completed the game in the Expert mode.
You collected all the items in the НО scenes.
You passed HO scene less than 30 seconds.
You've found the lair of the vampires.
You destroyed the wall and get into the city.
You got into the shop and found Matt's photo.
You found the diary of the priest.
You found the lair of the Daylight Guard.
You managed to kill the Daylight Guard.
You managed to sneak into the house of one of the twins.
You found 3 items for 3 seconds.