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