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