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