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