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