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.
Face off against 100 enemies using custom battle mode.
(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.
Kill 10 enemies with a throwing weapon's secondary function.
Amass a fortune of 100,000 denars.
As a female character, raise your renown to 50.
Get either two agility related skills to 5 or one to 7.
As a female character get into a duel with male lord by insulting him.
Kill 75 enemies with horse archery.
Have a 7 in one of the following skills or a 5 in two; Tracking, Path-finding, or Spotting.
Kill 50 men as a female character.
Raise your soldiers' morale from low to excellent.
Raid 3 caravans and raid 3 villages.
Visit every major town in Calradia.
Defeat 10 enemy parties in the snowy regions of Calradia.
You and your army have killed or wounded 5,000 enemy troops.
Get one of your healing skills to 5.
Learn 3 poems from tavern bards.
Be granted your first fief.
Camp in the Sarranid region of the map.
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.
Eat 6 different types food concurrently.
Have a -50 relation with a lord, village, or faction.
Kill or wound at least 500 enemies.
Harass wondering peasants on the map.
Make one of your ranged weapon skills 250.
Make one of your melee weapon skills 250.
(MP) Your team successfully defended a castle in siege battle mode.
Install and play one mod.
Help a lord or party win a fight.
Recruit 6 hero characters.
Enter and win a tournament.
Sell 5 people to the ransom broker.
Get either two strength related skills to 5 or one to 7.
Engage in a conversation with a hero character through the party screen.
Cleanse the town of bandits in the opening mission.
Successfully defend a castle.
Kill 75 enemies with throwing weapons.
Win a battle against a lord or party who previously beat or captured you.
Land a shot with a difficulty of 5 while using a throwing weapon.
Kill 10 parties of Mountain Bandits.
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.
Get the engineering skill up to 5.
Steal 3 cattle from a single village.
Finish reading one book through the camping screen.
Get Married.
Get a character to elope.
Be chosen as marshall.
Promote one of your followers into a position of power.
Rule all of Calradia!
Put a pretender on their rightful throne.
Pick a fight with a lord by insulting him or by challenging him to a duel.
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) Kill 25 people with throwing weapons.
(MP) Perform 25 lance kills while mounted.
(MP) Win one round in battle mode.
(MP) Slay 50 foes with slashing weapons.
(MP) Kill 25 foes with a blunt weapon.
(MP) Kill 50 foes with throwing axes.
(MP) Win in Conquest mode.
(MP) Win a round of team deathmatch mode.
(MP) Win a round of deathmatch 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: Might Makes Right, Choppy Chop Chop, Glorious Mother Faction, and Old school Sniper.
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.