Here is the full list of all 100 Knights of Honor II: Sovereign achievements.
Establish a colony.
Hold Constantinople, Mecca and Rome at the same time.
Win a naval battle.
Actively end disorder in 200 provinces.
Have the Ecumenical patriarch as a knight in your court.
Convert 100 provinces to your kingdom’s religion.
Defeat a crusader army marching against you.
Conquer 250 provinces by force.
Have your king lead a crusade.
Pillage 100 settlements.
Declare war on a kingdom with which you’ve signed a non-aggression pact.
Win the game.
Win a Grand Campaign after starting with a single-province-sized kingdom.
Win a game by becoming the Emperor of the World.
Win a Grand Campaign in under 5 in-game hours.
Instigate a crusade.
Have your army killed by the arrows of a nearby town or castle.
Declare war on Salamanca.
Destroy 50 kingdoms.
Sign 50 trade agreements.
Reach 500 gold income from trade.
Establish a caliphate.
Claim independence.
Complete a Scholar’s journey.
Destroy the Papacy.
Top all 3 Wealth-related rankings at the same time.
Produce Maps.
Fully develop an advantage.
Reach 400 commerce.
Participate in a battle, in which 3 other kingdoms are involved.
Lead an alliance of at least 3 kingdoms.
Start a war by sending or refusing a territorial claim.
Have at least 3 pagan beliefs promoted at the same time.
Fail an Emperor of the World claim.
Have the opinions of all society classes reach maximum values at the same time.
Have one of your towns become a trade center.
Have a non-Marshal (nor Shaman) knight lead an army.
Use all building slots in a town.
Have a cleric of yours become the Pope.
Reach 200 gold income.
Reach 100 levies income.
Have 6 marshals at the same time in your royal court.
Start a multiplayer game.
Pillage 15 settlements in a single game.
Have 3 or more rebellions simultaneously.
Top all 3 Conquest-related rankings at the same time.
Reach 150 food production.
Support another player in a battle.
Top all 3 Society-related rankings at the same time.
Reach 100 books income.
Reach 100 piety/faith/tradition income.
Provoke war between two kingdoms with a Spy action.
Execute or assassinate a king.
Defeat a rebellion by force.
Reach the maximum level with all of your court knights.
Overtake a foreign province.
Destroy a kingdom.
Lose a level 15 character.
Become a Great power.
Reach the maximum level with one of your knights.
Top a ranking.
Hire knights in each slot of your royal court.
Help your knight escape from a dungeon by using a Spy.
Organize a prison revolt.
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.
Destroy the kingdom of another player.
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.
Top all 3 Culture-related rankings at the same time.
Top all 3 Politics-related rankings at the same time.
Claim autocephaly.
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 developing all advantages.
Top all rankings at the same time.
Own 100 provinces.
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.
Reach the west end of the known world.
Execute 10 prisoners in a single game.
Own 5 trade centers at the same time.
Gain 20 provinces via diplomacy.
Win 1000 battles.
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.