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