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