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