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