Here is the full list of all 53 Rainbow Moon trophies - there are 42 bronze, 8 silver, 2 gold and 1 platinum.
Obtain all other trophies to unlock the platinum trophy.
Acquire and learn all available skills for any of your main characters. (The skill level doesn't matter)
Reach level 500 with any of your main characters.
Accumulate 500,000 Rainbow Coins in your inventory.
Win two 'Class-S' prizes in the lottery.
Reach level 250 with any of your main characters.
Improve your weapons or armor at the crafting shop 250 times.
Reach level 100 with any of your main characters.
Discover and enter the Forgotten Island, an optional area on Rainbow Moon.
Rebuild and obtain the Magic Portal Staff and defeat Namoris for the last time to gain unlimited warp access to the portal.
Complete 40 or more side quests.
Discover and use all wells on Rainbow Moon.
Learn at least 10 different passive skills with any of your main characters.
Discover and enter the Murky Basement, an optional dungeon in Burning Steppe.
Use any recovery well at least 15 times.
Win five 'Class-A' prizes in the lottery.
Discover and enter the Warehouse, an optional dungeon in Taswan.
Use the camp at least 25 times.
Discover and enter Limwar's House, an optional dungeon in the Green Shimmer Forest.
Win 10 prizes in the lottery.
Level up any of your active skills to level 50 or higher.
Obtain at least 100 hidden treasure items.
Acquire all six main characters.
Obtain the Crystal Clasp artifact.
Obtain the Orb of Delusion artifact.
Stay overnight at the tavern 10 times.
Obtain the Magic Socket artifact.
Obtain the Ethereal Spike artifact.
Accumulate 2,500 Rainbow Coins in your inventory.
Kill at least 300 of the same type of monster.
Lose three battles.
Obtain the Twisted Pole artifact.
Create 100 new monsters by splitting existing monsters with the killing stroke.
Improve your weapons or armor at the crafting shop 50 times.
Acquire Serena.
Obtain the Fused Twilight Gem artifact.
Escape 30 times from a battle using the escape option.
Acquire Gorodo.
Obtain the Charged Magnet Coil artifact.
Accumulate 100 hours of play time.
Obtain the Mojo of Trust.
Obtain the Mojo of Torture.
Discover and enter the Ocher Stone Swamp, an optional area on Rainbow Moon.
Acquire Dozeru.
Improve your weapons or armor at the crafting shop 10 times.
Obtain the Mojo of Tears.
Defeat the monster that lives in the well in Cassar Village and get back to Stella.
Accumulate 200 Rainbow Pearls with any character before spending them at the savant.
Accumulate 40 hours of play time.
Acquire Trisha.
Help Sarrothrod in the Southport Mines to escape from the dungeon and return to Cassar Village.
Win 50 or more random encounter battles.
Win your first battle on Rainbow Moon.