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