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