Here is the full list of all 24 Monster High - New Ghoul In School trophies - there are 6 bronze, 11 silver, 6 gold and 1 platinum.
All other Trophies Complete
Obtain all Clothing Items.
Meet all characters in Monster High.
Have over 1000 Spirit Coins.
Leave for School with a Tidy Room.
Collect all Dusty Pennants.
Collect all Spirit Spiders.
Complete Standalone Events.
Find all the Shortcuts.
Complete Fashion Club Events.
Complete Cooking Club Events.
Save the School!
Upgrade the Casketball Court.
Upgrade the Creepateria.
Complete Robotics Club Events.
Complete Comic Book Club Events.
Complete Environmental Club Events.
Complete a Fundraising Event.
Collect all Cheer Steps.
Ring the Bell in the Bell Tower
Find and use a Locker Code.
Purchase Clothing Online.
Complete first Fearleading Event.
Complete first Council Event.