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.
Complete Standalone Events.
Complete Comic Book Club Events.
Collect all Dusty Pennants.
Upgrade the Casketball Court.
Complete Environmental Club Events.
Have over 1000 Spirit Coins.
Find all the Shortcuts.
Meet all characters in Monster High.
Collect all Spirit Spiders.
Upgrade the Creepateria.
Complete Robotics Club Events.
Complete a Fundraising Event.
Ring the Bell in the Bell Tower
Collect all Cheer Steps.
Leave for School with a Tidy Room.
Find and use a Locker Code.
Purchase Clothing Online.
Complete first Fearleading Event.
Complete first Council Event.
All other Trophies Complete
Complete Fashion Club Events.
Complete Cooking Club Events.
Save the School!
Obtain all Clothing Items.