Here is the full list of all 12 Birth of Shadows achievements.
Defeated the Lich boss in the campaign game without using a saved game during the fight.
Defeated the Minotaur boss in the campaign game without using a saved game during the fight.
Defeated the Skeleton boss in the campaign game without using a saved game during the fight.
Defeated the Slime boss in the campaign game without using a saved game during the fight.
Defeated the Troll boss in the campaign game without using a saved game during the fight.
Defeated the Venomblood boss in the campaign game without using a saved game during the fight.
Defeated the Werewolf boss in the campaign game without using a saved game during the fight.
Defeated the Wraith boss in the campaign game without using a saved game during the fight.
Rescued your fiancee in the campaign game.
Completed all of the quests in the campaign game.
Completed the tutorial quests in the campaign game.
Completed the first area in the campaign game.