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