Here is the full list of all 35 Runespell: Overture achievements.
Defeat Warghul
Defeat Dethgar and Ragnar
Win 3 battles without using any Powercards
Active a Powercard 50 times
Win 10 battles without leaving the game
Defeat Berendur twice
Win against an opponent with only 1 HP left on player side
Deal in total more than 5000 points of damage
Collect 1000 hacksilver in the game
Win 5 battles in a row
Deal in total more than 1000 points of damage
Open 5 Treasure boxes
Active a Powercard 10 times
Win 5 battles without leaving the game
Collect 100 hacksilver in the game
Use 5 card combinations in one battle
Use 3 card combinations in one battle
Win 10 battles in a row
Win 15 battles in a row
Deal in total more than 10 000 points of damage
Active a Powercard 100 times
Discover all major questlines in the game
Collect 10000 hacksilver in the game
Win 20 battles without leaving the game
Use 7 card combinations in one battle
Win 5 battles without using any Powercards
Win 7 battles without using any Powercards
Unlock all achievements
Survive Wyrd Sister's Time Stop
Defeat two Wardens stones
Defeat Gullveig
Play all battles once
Recruit all allies
Obtain all powercards
Finish the game