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