Here is the full list of all 39 Long Ago: A Puzzle Tale achievements.
Finish the story levels in Chapter III
Finish all coins levels in Chapter II
Collect three gems in all levels from Chapter II
Break 30 pots
Connect 10 crystal statues to crystal pillars
Finish the story levels in Chapter II
Use the optional hints system to see a gold solution
Use the undo button ten times in the same level
Use the option to listen to a chapter song
Finish all coins levels in Chapter I
Collect three gems in all levels from Chapter I
Have at least 100 coins in your purse
Activate 20 monk statues
Use the quick restart button
Finish the story levels in Chapter I
Change the way the ball looks
Use the optional hints system at least once
Use the option to read all the verses for a chapter
Finish all coins levels in Chapter III
Collect three gems in all levels from Chapter III
Finish the story levels in Chapter IV
Finish all coins levels in Chapter IV
Collect three gems in all levels from Chapter IV
Finish the story levels in Chapter V
Finish all coins levels in Chapter V
Collect three gems in all levels from Chapter V
Spend 300 coins on unlocking new looks for the ball
Unlock 15 looks for the ball
Light 25 lanterns
Open 15 gates
Activate 10 angel statues
Unlock the Challenges levels
Finish all levels in Challenges I
Collect three gems in all levels from Challenges I
Unlock 18 looks for the ball
Teleport 50 times
Put out 20 campfires
Activate 10 rune pillars
Open 15 treasure chests