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