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