Here is the full list of all 35 Forgotten Places: Regained Castle achievements.
Complete all Hidden Object scenes from Extras
Play through the game on Normal or Expert difficulty mode
Play through the game on the Expert difficulty mode
Complete all Hidden Object scenes without using hint
Play through all mini games without skipping
Play through the game on any difficulty mode
Use an elixir
Pass through the mini-game with the alchemical transmutations
Collect all 57 butterflies
Pass through the mini-game with the alchemy jars
Pass through the mini-game with the sliding blocks
Pass through the mini-game with the knots
Pass through the mini-game on the door lock
Pass through the mini-game within the crypt
Pass through the mini-game at the cemetery
Pass through the mini-game within the telescope
Pass through the mini-game within jewelry box
Pass through the mini-game with the cross
Pass through the mini-game with billiard balls
Pass through the labyrinth
Pass through the mini-game with metal flower
Pass through the mini-game on the satchel lock
Pass through the mini-game with the mirror
Pass through the mini-game in the cellar
Open the safe
Find 36 butterflies
Pass through the mini-game with portraits
Pass through the mini-game within the well shaft
Find full map of the castle
Pass through the mini-game within the globe
Enter the castle
Complete Hidden Object scene without using hint
Heading to the castle
Find a butterfly
Pass through the mini-game within the heroine's suitcase