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