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