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