Here is the full list of all 12 Mahjong Magic Journey achievements.
Complete The Black Castle
Achieve x15 index
Complete The Frozen Hills
Complete The Dragon Mountains
Complete 30 levels with the highest score
Complete The Soaring Island
Complete The Golden Sands
Get 30 keys
Earn 100.000 points
Remove 1000 pairs of tiles
Use bonus 50 times
Complete The Enchanted Forest