Here is the full list of all 18 Brightstone Mysteries: The Others achievements.
Completed the game
FInish all minigames without skipping a single one
Finish all Hidden Object scenes without using hints
Finish the game on Expert Mode, without skipping any minigame or usining hint at all!
Collected all rings
Made a perfect cup of coffee
Tranquilized the rhino
Unlocked the safe
Assembled the board
Completed the maze
Entered the factory
Escaped the pit
Visited/Played every attraction (without skipping!)
Unlocked flower shaped lock
Entered abandoned house
Opened the hidden door
Checked in the hotel
Found the hiden note