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