Here is the full list of all 12 Mahjong Gold trophies - there are 7 bronze, 4 silver and 1 gold.
Complete the Cave stage
Complete the Reefs stage
Complete 30 levels with the highest score
Complete the Beach stage
Complete the Ridge stage
Complete the Shoal stage
Earn 100.000 points
Use bonus 50 times
Remove 1000 pairs of tiles
Complete the Lagoon stage
Earn 30 stars
Achieve x5 index