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