Here is the full list of all 40 Tales of Aravorn: Seasons Of The Wolf achievements.
Romance Chalassa with Althea
Find Nutty Nutt's Treasure in Act 3
Don't allow the Master of the Pits to take more than 10 gold from you
Romance Jariel with Althea
Romance Krimm with Shea
Romance Riley with Shea
Defeat Mormont playing in Hard or Nightmare difficulty
Defeat Giant Snow Spider playing in Hard or Nightmare difficulty
Defeat Yeldin playing in Hard or Nightmare difficulty
Never lose an arena fight playing in Hard or Nightmare difficulty
Defeat Captain Starrad playing in Hard or Nightmare difficulty
Defeat the Kraken playing in Hard or Nightmare difficulty
Defeat Deceit playing in Hard or Nightmare difficulty
Defeat Jul playing in Hard or Nightmare difficulty
Defeat the Spirit Bear playing in Hard or Nightmare difficulty
Defeat the Grand Mogul playing in Hard or Nightmare difficulty
Defeat Warchief Auris playing in Hard or Nightmare difficulty
Defeat Ur'ghan the Minotaur playing in Hard or Nightmare difficulty
Save Chalassa's soul to get a happy romance ending
Complete Riley's personal quest playing in Hard or Nightmare difficulty
Complete Krimm's personal quest playing in Hard or Nightmare difficulty
Complete Chalassa's personal quest playing in Hard or Nightmare difficulty
Complete Jariel's personal quest playing in Hard or Nightmare difficulty
Complete Vaelis' personal quest playing in Hard or Nightmare difficulty
Complete Rowinda's personal quest playing in Hard or Nightmare difficulty
End the game without any romance
Do 25 battles without using Shea or Althea
Get your ship almost sunk during a sea battle in Easy mode
Complete all quests in all Seasons of the game!
Discover all locations in all Seasons of the game!
Find the ratmen in all seasons of the game!
Reach level 25 with any party member!
Pick Artas during Bad Blood DLC first exploration!
Kill the Giant Bee Queen playing in Hard or Nightmare difficulty
Kill the Dark Elf Alchemist playing in Hard or Nightmare difficulty
Kill the Giant Gnoll playing in Hard or Nightmare difficulty
Complete the palisade in time
Get the Council killed
Defend Ninim from the Gnolls with the help of volunteers
Play the hidden scene with Rowinda after the credits