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