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.
Finish the game in Expert mode
Unlock all the other Achievements
Complete all Hidden Object Scenes without using hint
Find the Philosopher Stone
Read all the notes placed in the game
Finish all minigames without skipping
Find all mysterious scrolls
Save Teacher
Ride down the mine
Defeat Grand Master
Finish any Hidden Object Scene in less than 1 minute
Save Widow
Save Fireman
Complete one puzzle with less then 5 mistakes
Find 4 mysterious scrolls
Watch the first 10 cutscenes
Save Fisherman
Finish three minigames in a row without skipping
Save fishes
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