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