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