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