Here is the full list of all 12 Letter Quest Remastered trophies - there are 7 bronze, 4 silver and 1 gold.
Earn 40 crystal stars
Earn 120 yellow stars
Defeat 250 monsters
Purchase 30 upgrades
Purchase 50 merchant items in battle
Complete 50 quests
Open 10 treasure chests
Use 25 plague tiles
Spell 3 words with no vowels
Finish a stage with full health
Spell 3000 words
Do 100 critical attacks