Here is the full list of all 16 Winter Wastelands achievements.
Defeated the first boss (The Crystal Angel)
Defeat the second boss (The Harvester)
Defeat the third boss (The Last Woven)
Defeat the fourth boss (The Knight)
Defeat the fifth boss (Tecnho)
Defeat the sixth boss (Hydro)
Defeat the seventh and final boss (Fear)
Met The Ghost Traveler
Met Pinky
Met The Oracle
Met The Elder
Beat the game!
Acquired all journal entries
Pet the dog
Return the dog to its owner
Complete all puzzles