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