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