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