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