Here is the full list of all 49 King's Bounty II achievements.
Complete the game as Katharine.
Transform 5 enemy units into chickens with a spell and burn them.
Earn max points in the Ideal of Finesse.
Complete the game as Aivar.
Defeat Nim in the final battle without using the Book of Magic.
Side with Tenebros during the “Aranox’s Shadow” quest.
Earn max points in the Ideal of Anarchy.
Side with Tenebros during “The Merchant Guild’s Secrets” quest.
Win a battle while dressed in all 3 of Maximilian’s sets.
Earn max points in the Ideal of Power.
Side with the Artisanians during the “Widow’s Kiss” quest.
Side with the Artisanians during the “Tabula of Tinciduntion” quest.
Side with the Artisanians during the “Through the Quarantine” quest.
Side with Tenebros during the “Philanthropist and Patron of the Arts” quest.
Win 10 battles with an army that consists of units of 4 ideals.
Win 40 battles without using the Book of Magic.
Catch the wolf during the “Trappers” quest.
Side with Tenebros during the “A Corrupt Guard” quest.
Master all spells of the School of Earth and Ice.
Master all spells of the School of Life and Light.
Master all spells of the School of Death and Darkness.
Master all spells of the School of Air and Fire.
Complete the game as Elisa.
Defeat Nim in the final battle.
Defeat Montier.
Complete “The Scryer’s Trials” quest.
Assemble all 3 of Maximilian’s equipment sets.
Defeat Aranox.
Collect all paintings.
Side with Horace during the “Aranox’s Shadow” quest.
Reach the hero’s max level.
Earn max points in the Ideal of Order.
Defeat Dupont in 2 battles.
Side with Horace during “The Merchant Guild’s Secrets” quest.
Discover all travel steles.
Collect at least 300,000 gold.
Destroy 70 enemy armies.
Side with Horace during the “Philanthropist and Patron of the Arts” quest.
Side with the Nostrian mages during the “Tabula of Tinciduntion” quest.
Side with the Nostrian mages during the “Widow’s Kiss” quest.
Side with the Nostrian mages during the “Through the Quarantine” quest.
Win 15 battles with an army that consists of units of 3 ideals.
Side with Horace during the “A Corrupt Guard” quest.
Dress as a bandit.
Heal the Thousand Year Oak from its illness.
Complete the “Priceless Chicks” quest.
Complete the Albian Highlands.
Complete the tactical tutorial.
Escape the prison.