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.
As a female character, become queen of all Calradia.
Rule all of Calradia!
As a female character, make your own faction.
Be chosen as marshall.
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.
As a female character, give a companion character a great sword.
(MP) Kill 100 people with mounted projectiles.
You have completed the following achievements: Trick Shot, Khaaan!, Agile Warrior, and Harassing Horseman.
(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) Win in Conquest mode.
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: Abudant Feast, Mace in yer Face!, Sarranidian Nights, and Art of War/Melee Master.
You have completed the following achievements: Might makes Right, The Huscarl, Melee Master/Dexterous Dastard, and Holy Diver/Elite Warrior.
(MP) Kill 50 foes with throwing axes.
(MP) Kill 25 people with throwing weapons.
(MP) Win one round in battle mode.
(MP) Your team successfully defended a castle in siege battle mode.
(MP) Win a round of deathmatch mode.
(MP) Slay 50 foes with slashing weapons.
As a female character get into a duel with male lord by insulting him.
Get a character to elope.
Install and play one mod.
You have completed the following achievements: Melee Master, Knights of the Round, Every breath you take, I dub thee/Good Samaritan.
Recruit 6 hero characters.
Win a battle against a lord or party who previously beat or captured you.
Learn 3 poems from tavern bards.
As a female character, raise your renown to 50.
(MP) In any multiplayer mode have more kills than deaths.
Kill 10 enemies with a throwing weapon's secondary function.
Land a shot with a difficulty of 5 while using a throwing weapon.
As a ruler conquer 10 towns or castles.
Become the owner of at least 5 fiefs.
Kill 75 enemies with throwing weapons.
Kill 50 men as a female character.
Make one of your melee weapon skills 250.
Pick a fight with a lord by insulting him or by challenging him to a duel.
Successfully defend a castle.
Make one of your ranged weapon skills 250.
Amass a fortune of 100,000 denars.
Get one of your healing skills to 5.
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.
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.
Get either two strength related skills to 5 or one to 7.
Face off against 100 enemies using custom battle mode.
As a ruler have 3 vassals.
Kill 10 parties of Mountain Bandits.
You and your army have killed or wounded 5,000 enemy troops.
Promote one of your followers into a position of power.
Make your own faction.
Get Married.
Raid 3 caravans and raid 3 villages.
Land a shot with a difficulty of 10 while using a bow and arrow.
Get the engineering skill up to 5.
Have a -50 relation with a lord, village, or faction.
Harass wondering peasants on the map.
Be granted your first fief.
Kill or wound at least 500 enemies.
Finish reading one book through the camping screen.
Cleanse the town of bandits in the opening mission.
Visit every major town in Calradia.
Camp in the Sarranid region of the map.
Kill 75 enemies with horse archery.
Defeat 10 enemy parties in the snowy regions of Calradia.
Raise your soldiers' morale from low to excellent.
Help a lord or party win a fight.
Enter and win a tournament.
Eat 6 different types food concurrently.
Steal 3 cattle from a single village.
Engage in a conversation with a hero character through the party screen.
Sell 5 people to the ransom broker.
Land a shot with a difficulty of 6 while using a crossbow.