Here is the full list of all 51 Mount & Blade II: Bannerlord achievements worth 1,000 gamerscore.
Own a workshop and a caravan at the same time.
First born child.
Obtain your first fief.
Start your own kingdom.
Finish the tutorial.
Defeat Radagos in a duel.
Defeat a force that has 500 more troops than you.
Imperial victory.
Barbarian victory.
Conquer all Calradia.
Achieve an income of 10.000 denars a day.
Assemble The Dragon Banner of Calradia.
Capture a town on your own.
Execute a lord that you have -100 relations with.
Reach clan tier 6.
Clear a hideout.
Propose and win a policy.
Kill a King or Queen in battle.
Complete all projects in a settlement.
Repel an attack on the walls.
Marry the widow of a lord or lady you personally executed.
Become the leader of the tournament board.
Increase any skill to 300.
Have 100 butter in your inventory.
Visit every settlement in the world in a game.
Defeat 10.000 enemies.
Craft a tier 6 sword.
Have your 7th kid born.
Score a headshot from 200 meters away.
Defeat an army with your party alone.
Become a great grandparent.
Execute a lord that has killed one of your clan members.
Win 100 battles against enemy armies.
Assault and capture 100 fortifications.
Get 1.000 in tributes in a single day.
Become a king or queen with 21 clans under your rule.
Win 100 tournaments.
Make 1 million denars trade profit.
Spawning on foot, commandeer a mount and kill 5 enemy players without dying.
Kill 3 enemy players with a single mangonel shot.
Kill 100 enemy players with headshots using ranged weapons in multiplayer.
Kill 10.000 other enemies in captain mode with your troops.
Kill an enemy player with a boulder.
In multiplayer, kill 500 troops with ranged weapons while on horseback.
In multiplayer, kill 500 troops with couched lances.
Kill 10 enemies with a successful chain attack combo.
Kick an enemy player off a wall to death.
Kill 100 enemies with charge damage in multiplayer.
Get melee, mounted melee, ranged, mounted range and couch lance kills in a skirmish round.
Unlock all other Achivements.
Complete an issue of a hostile town.