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