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