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