Full list of all 11 Time Mysteries 2: The Ancient Spectres achievements. It takes around 4-5 hours to unlock all of the achievements on Windows.
Unlocked all the other Achievements.
Finish the bonus chapter
Complete the game
Finish all Hidden Object Puzzles without using hints.
Finish all Mini-Games without skipping.
Finish any Hidden Object Puzzle in less than 1 minute.
Finish 15 Hidden Object Puzzles in a row without using hints.
Finish any Hidden Object Puzzle with less than 4 mis-clicks.
Find 3 hidden-objects within 3 seconds.
Finish 4 Mini-Games in a row without skipping.
Finish any Mini-Game in less than 1 minute.