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