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