Here is the full list of all 6 Quiztopia: The Ultimate Trivia (EU) trophies - there are 6 gold.
You have to complete 10 levels of English Category.
You have to complete 10 levels of Maths Category.
You have to complete 10 levels of Science Category.
You have to complete 10 levels of Geography category.
You have to complete 10 levels of Reasoning Category.
You have to complete 10 levels of Picture Category.