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