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