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