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