Here is a spoiler free walkthrough to achieve the very basic ending.
For the other endings you're on your own!
-Leave the first room and get to the cross like room
-Take the matches from the small room in the left
-Check the open grave in the small room in the right
-Notice the names' initials on the grave and put them in order based on age
-Go to the main hall through the right door of the library
-Check the dinning room on the right of the main hall
-Return to the library and check the office located to the left side
-Open the lights
-Check the far drawer
-After you put the painting in its place check the right statue
-Go to the second floor from the main stairs and enter the lower right door
-Enter the bedroom and check its bathroom (it's on the far right)
-Search the drawers next to the body
-Back in the bedroom check the little chest
-From the main second floor hall, go to the lower left door
-Enter the far bottom left room and check the drawer
-Go to the dinning room and open the upper door
-In the corridor after the dinning room enter the room opposite of the door
-Search the butler
-Back in the corridor enter the kitchen(lower right door) and go down the stairs
-In the cellar the clues for the chest are
-The numbers for the password come by adding the numbers of the wines amount
-The dates show you in what order the numbers go
-The numbers 1,4,6,8 are the only numbers used in the password
-Go to the main hall and check the right dragon statue
-On the second floor enter the upper left door
-After the balcony go to the right room and then to the other right room
-If you choose to "stay and search" go the corridor after the balcony and enter the left door
-According to the notes press the colored switches in order
-When the books go black except one row take the painting
-Return to the art gallery and use it
-After the secret art room return to the main hall and enter the upper left door
-Proceed to the courtyard using the north door and continue along the corridor
-If you choose to "explore the courtyard" return the corridor past to the balcony and go down the stairs
-Enter the corridor through right door and then the courtyard on the north
-After the maze, past the first house, go where the three houses are
-Search the first floor of the right house
-Search the small barn above the left house
-Enter the left house and check the fireplace
-Go to the second floor of the right house
-Examine the icon
-There are four hidden words
-Each word contains only one of the highlighted letters
-Enter the code in the chest
-Go north and open the gate. Continue along the cemetery into the church
-Check the crosses
-Go to the right room and up the stairs
-Ring the bell three times
-Check the altar and then enter the mausoleum from the cemetery
-In the obelisks you need to find three words
-The first and third word can be found in the upper right obelisk
-The second word is upper left obelisk formed by the red letters
--------->For different endings search some more by yourself next time you play
