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