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