Here is the full list of all 13 Lost Grimoires: Stolen Kingdom achievements. It takes around 3-4 hours to unlock all of the achievements on Windows.
Find all Kestrel symbols.
Finish the game.
Finish all Minigames without skipping.
Finish all Hidden Object Puzzles without using hints.
Finish 6 Hidden Object Puzzles in a row without using hints.
Find half of the Kestrel symbols.
Finish any Hidden Object Puzzle with less than 4 mistaps.
Play through the first hour of the game without skipping cutscenes.
Finish 4 Minigames in a row without skipping.
Finish any Minigame in less than 1 minute.
Find one Kestrel symbol.
Finish any Hidden Object Puzzle in less than 1 minute.
Find 3 hidden objects within 3 seconds.