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