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