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