Here is the full list of all 20 Portal of Evil: Stolen Runes Collector's Edition achievements.
Complete three mini-games in a row without a skip
Make less than five mistakes in a hidden object scene
Find the first letter from grandpa
Spend less than a minute on a mini-game
Complete all mini-games without a single skip
Spend less than a minute on a hidden object scene
Find three items in three seconds
Complete three hidden object scenes without hints
Complete all hidden object scenes without hints
Go through the portal
Encounter the beast
Overcome the beast
Free the priest from the Mayan tribe
Visit all worlds
Complete the bonus level
Insert the first seal into the gate
Insert three seals into the gate
Complete the game (Expert mode)
Unlock all achievements
Find all the letters from grandpa