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