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