Here is the full list of all 12 Portal of Evil: Stolen Runes trophies - there are 7 bronze, 4 silver and 1 gold.
Complete the bonus level
Complete all hidden object scenes without hints
Find all the letters from grandpa
Complete all mini-games without a single skip
Visit all worlds
Insert the first seal into the gate
Overcome the beast
Spend less than a minute on a mini-game
Make less than five mistakes in a hidden object scene
Go through the portal
Find three items in three seconds
Find the first letter from grandpa