Here is the full list of all 50 Mount & Blade II: Bannerlord achievements.
Craft a tier 6 sword.
Become a king with 21 clans under your rule.
First born child.
Start your own Kingdom.
Acquire 10000 denars a day.
Increase any skill to 300.
Have 100 butters in your inventory.
Propose and win a policy.
Capture a town on your own.
Reach clan tier 6.
Defeat an Army with your party alone.
Defeat a force that has 500 more troops than you
Execute a lord that you have -100 relations with.
Repel an attack on the walls.
Obtain your first fief.
Clear a hideout.
Assemble Dragon Banner of Calradia.
Execute a lord that has executed one of your clan members.
Kill 10.000 other opponents in captain mode, with your troops.
Kill an enemy player with a boulder
Win 100 tournaments.
Score a headshot from 200 meters away.
Defeat 10.000 troops.
Defeat Radagos in a duel.
Own a workshop and a caravan at the same time.
Visit every settlement in the world in a game.
Make 1 million denars trade profit.
Barbarian victory.
Become the leader of the tournament board.
Become a great grandparent.
Kill 100 enemy players with headshots with ranged weapons in multiplayer.
Marry the widow of a lord or lady you personally executed.
Get a kill with a melee weapon, mounted melee, ranged, mounted range, and cauch lance in one skirmish round.
Kill a faction King or Queen in battle.
Win 100 battles against enemy armies.
Kill 500 troops with a couched weapon while on horseback.
Imperial victory.
Have your 7'th kid born.
Kill 500 troops with range weapons while on horseback.
Assault and capture 100 fortifications.
Kill 100 enemies with charge damage in multiplayer.
Kill 10 enemies with a successful chain attack combo.
Kill 3 enemy players with a single mangonel shot.
Conquer all Calradia.
Get 1.000 in tributes in a single day.
Kick an enemy player off a wall to death.
Finish tutorial.
Complete an issue in a hostile town.
Complete all projects in a settlement.
Spawning on foot, commandeer a mount and kill 5 enemy players without dying.