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