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