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