Here is the full list of all 100 Knights of Honor II: Sovereign achievements.
Overtake a foreign province.
Execute or assassinate a king.
Pillage 15 settlements in a single game.
Reach 200 gold income.
Use all building slots in a town.
Start a multiplayer game.
Reach the maximum level with one of your knights.
Hire knights in each slot of your royal court.
Reach 500 gold income from trade.
Produce Maps.
Help your knight escape from a dungeon by using a Spy.
Organize a prison revolt.
Have a non-Marshal (nor Shaman) knight lead an army.
Provoke war between two kingdoms with a Spy action.
Top a ranking.
Destroy a kingdom.
Declare war on a kingdom with which you’ve signed a non-aggression pact.
Support another player in a battle.
Lead an alliance of at least 3 kingdoms.
Defeat a rebellion by force.
Claim independence.
Fully develop an advantage.
Win the game.
Make all Upgrades of a Cathedral or a Grand Mosque.
Make all Upgrades of a University or a Madrasah.
Make all Upgrades of a Royal Palace.
Make all Upgrades of a Trade Port.
Instigate a crusade.
Have your king lead a crusade.
Defeat a crusader army marching against you.
Destroy the kingdom of another player.
Participate in a battle, in which 3 other kingdoms are involved.
Win a naval battle.
Reach the maximum level with all of your court knights.
Pick a new kingdom in a multiplayer game after your first one was destroyed.
Assassinate a knight of another player with a Spy.
Have an army reach 7,000 manpower.
Complete a Scholar’s journey.
Establish a colony.
Become a Great power.
Top all 3 Conquest-related rankings at the same time.
Top all 3 Wealth-related rankings at the same time.
Top all 3 Culture-related rankings at the same time.
Top all 3 Society-related rankings at the same time.
Top all 3 Politics-related rankings at the same time.
Reach 100 levies income.
Reach 100 books income.
Reach 100 piety/faith/tradition income.
Reach 150 food production.
Reach 400 commerce.
Have one of your towns become a trade center.
Have a cleric of yours become the Pope.
Have the Ecumenical patriarch as a knight in your court.
Establish a caliphate.
Claim autocephaly.
Destroy the Papacy.
Have at least 3 pagan beliefs promoted at the same time.
Win a Grand Campaign after starting with a single-province-sized kingdom.
Win a Peasant’s Rush game by reaching the target kingdom’s size.
Win a Greedy Kings game by collecting the target amount of gold.
Win Destroy kingdom by destroying the target kingdom.
Win a “First blood” game by destroying an opponent.
Win a game by becoming the Emperor of the World.
Win a game by developing all advantages.
Top all rankings at the same time.
Win a Grand Campaign in under 5 in-game hours.
Own 100 provinces.
Hold Constantinople, Mecca and Rome at the same time.
Have the opinions of all society classes reach maximum values at the same time.
Change your kingdom's religion twice in a single game.
Refuse peace offer when you have only one town, that is being besieged.
Initiate break siege with your king from within a town.
Become a vassal.
Declare independence while playing with Scotland.
Adopt Heroes and Battles beliefs.
Send gold to another kingdom while playing as Leinster.
Declare war on Salamanca.
Reach the west end of the known world.
Have your army killed by the arrows of a nearby town or castle.
Start a war by sending or refusing a territorial claim.
Lose a level 15 character.
Execute 10 prisoners in a single game.
Own 5 trade centers at the same time.
Gain 20 provinces via diplomacy.
Conquer 250 provinces by force.
Convert 100 provinces to your kingdom’s religion.
Pillage 100 settlements.
Actively end disorder in 200 provinces.
Win 1000 battles.
Destroy 50 kingdoms.
Using a diplomat, improve your relations with other kingdoms 1,000 times.
Sign 50 trade agreements.
Vassalize 50 kingdoms.
Bribe 100 knights.
Import 20 goods.
Have 6 marshals at the same time in your royal court.
Adopt Oceans and Raids beliefs.
Have 3 or more rebellions simultaneously.
Fail an Emperor of the World claim.
Win a War for Goods game by producing the target amount of goods.