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