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