Here is the full list of all 50 Mount & Blade II: Bannerlord achievements.
First born child.
Own a workshop and a caravan at the same time.
Become the leader of the tournament board.
Assemble Dragon Banner of Calradia.
Complete an issue in a hostile town.
Repel an attack on the walls.
Capture a town on your own.
Defeat an Army with your party alone.
Obtain your first fief.
Propose and win a policy.
Finish tutorial.
Clear a hideout.
Defeat Radagos in a duel.
Defeat a force that has 500 more troops than you
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 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.
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.
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.
Kick an enemy player off a wall to death.
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.