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