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