Here is the full list of all 80 Mount & Blade: Warband achievements. It takes around 150-200 hours to unlock all of the achievements on Windows.
Get Married.
Get a character to elope.
Rule all of Calradia!
Win a battle against a lord or party who previously beat or captured you.
Promote one of your followers into a position of power.
(MP) Win in Conquest mode.
(MP) Kill 50 cavalry while on foot, the enemy must be killed while mounted.
You have completed the following achievements: Mace in yer Face!, Spoil the Charge, Agile Warrior, and This is our land.
(MP) Your team successfully defended a castle in siege battle mode.
(MP) Win a round of team deathmatch mode.
You have completed the following achievements: Might Makes Right, Choppy Chop Chop, Glorious Mother Faction, and Old school Sniper.
(MP) Win one round in battle mode.
As a ruler conquer 10 towns or castles.
As a ruler have 3 vassals.
Make your own faction.
As a female character, make your own faction.
Put a pretender on their rightful throne.
As a female character, help a female claimant reclaim her throne.
Assist your faction in conquering Calradia.
As a female character, become queen of all Calradia.
As a female character, give a companion character a great sword.
Get either two agility related skills to 5 or one to 7.
You have completed the following achievements: Trick Shot, Khaaan!, Agile Warrior, and Harassing Horseman.
Have a 7 in one of the following skills or a 5 in two; Tracking, Path-finding, or Spotting.
Become the owner of at least 5 fiefs.
Raise your soldiers' morale from low to excellent.
Make one of your ranged weapon skills 250.
Land a shot with a difficulty of 5 while using a throwing weapon.
Kill 75 enemies with throwing weapons.
Make one of your melee weapon skills 250.
You have completed the following achievements: Might makes Right, The Huscarl, Melee Master/Dexterous Dastard, and Holy Diver/Elite Warrior.
You have completed the following achievements: Melee Master, Knights of the Round, Every breath you take, I dub thee/Good Samaritan.
Amass a fortune of 100,000 denars.
(MP) Kill 100 people with mounted projectiles.
(MP) Kill 25 foes with a blunt weapon.
You have completed the following achievements: Abudant Feast, Mace in yer Face!, Sarranidian Nights, and Art of War/Melee Master.
(MP) Kill 50 foes with throwing axes.
Get the engineering skill up to 5.
Kill 10 enemies with a throwing weapon's secondary function.
Raid 3 caravans and raid 3 villages.
Pick a fight with a lord by insulting him or by challenging him to a duel.
As a female character get into a duel with male lord by insulting him.
Defeat 10 enemy parties in the snowy regions of Calradia.
Visit every major town in Calradia.
Get one of your healing skills to 5.
Harass wondering peasants on the map.
As a female character, Capture and sell three NPC lords.
Kill 10 parties of Mountain Bandits.
Land a shot with a difficulty of 10 while using a bow and arrow.
Finish reading one book through the camping screen.
Kill 50 men as a female character.
As a female character, raise your renown to 50.
(MP) Perform 25 lance kills while mounted.
(MP) Slay 50 foes with slashing weapons.
(MP) In any multiplayer mode have more kills than deaths.
(MP) Win a round of deathmatch mode.
(MP) Kill 25 people with throwing weapons.
Face off against 100 enemies using custom battle mode.
Be chosen as marshall.
You and your army have killed or wounded 5,000 enemy troops.
Kill 75 enemies with horse archery.
Have two of the following skills at a 5; Looting, Inventory Management, Trade, or Prisoner Management.
Have two of the following skills at a 5; Trainer, Tactics, Leadership, or Persuasion.
Successfully defend a castle.
Recruit 6 hero characters.
Learn 3 poems from tavern bards.
Camp in the Sarranid region of the map.
Get either two strength related skills to 5 or one to 7.
Kill or wound at least 500 enemies.
Be granted your first fief.
Land a shot with a difficulty of 6 while using a crossbow.
Steal 3 cattle from a single village.
Have a -50 relation with a lord, village, or faction.
Engage in a conversation with a hero character through the party screen.
Eat 6 different types food concurrently.
Enter and win a tournament.
Cleanse the town of bandits in the opening mission.
Help a lord or party win a fight.
Sell 5 people to the ransom broker.
Install and play one mod.