Here is the full list of all 25 Dark Heritage: Guardians of Hope achievements. It takes around 2-3 hours to unlock all of the achievements on Windows.
Complete one puzzle with less then 5 mistakes
Unlock all the other Achievements
Finish the game in Expert mode
Find the Philosopher Stone
Finish all minigames without skipping
Complete all Hidden Object Scenes without using hint
Find all mysterious scrolls
Defeat Grand Master
Save Teacher
Ride down the mine
Read all the notes placed in the game
Save Fireman
Save Widow
Find 4 mysterious scrolls
Watch the first 10 cutscenes
Save Fisherman
Finish any Hidden Object Scene in less than 1 minute
Save fishes
Finish three minigames in a row without skipping
Find 3 Hidden Objects in less than 3 seconds
Travel to Cannon Rock
Find mysterious scroll
Use cradle
Finish a minigame in less than 1 minute
Complete any Hidden Object Puzzle without using hints