Full list of all 82 Might is Right achievements.
The base game contains 16 achievements, and there is 1 DLC pack containing 66 achievements.
Defeat 1 hero
Defeat 3 giants
Defeat Sir Caradoc
Defeat Aspect of Dark Art
Defeat Aspect of Arcane
Defeat Aspect of Water
Defeat Aspect of Air
Defeat Aspect of Fire
Defeat Aspect of Earth
Defeat each giant at least once
Defeat 30 enemies
Gain Blessing of the Earth
Gain Blessing of the Youth
Gain Blessing of Luck
Gain Blessing of Vigour
Gain Blessing of Power
Gain Blessing of Wisdom
Gain Witches' Chant
Gain Blessing of the Wind
Gain all Blessings
Gain buff Campfire Dinner
Gain buff Well Water
Gain buff Well Water 10 times
Use a Portal Stone
Use every Portal Stone