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