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