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