Here is the full list of all 8 The Winter's Deal - there are Frosty Edition achievements.
Complete both "Eight Red Baron Flowers" and "Five Lost Pages" quests.
Defeat the Enormous Chickapooni in the well.
Buy Vald's teleportation service.
Save all four chickapoonized people.
Defeat all enemies inside Frostchill Passage.
Complete the "Children's Presents" quest.
Find all 7 Secret Rooms.
Finish the game!