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