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