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