Here is the full list of all 21 Mount & Blade: With Fire and Sword achievements.
Tend to your army's illnesses, five times, by resting or feeding them.
You've made 1,000,000 thaler from using trade caravans.
Complete the summer feast quest found in any village on the eastern side of the map.
You've made 100,000 thaler from using trade caravans.
Keep 10 bundles of velvet in your inventory.
Build three upgrades in a single town/castle you control.
Finish the Polish Commonwealth's main storyline quest "The Deluge"
Earn 3,000 thaler in profit from a single caravan trade.
Join the Crimean Khanate and eliminate all other factions.
Using any firearm; kill 100 enemies.
Join the Kingdom of Sweden and eliminate all other factions.
Finish the Moscovite Tsardom's main storyline quest "The False Dmitry"
Finish the Cossack Hetmanate's main storyline quest "The Black Mace"
As any faction; conquer the map and eliminate all other factions.
Successfully blow a hole in a castle/town wall before a siege.
Build a wagon fort from the camp menu.
Start any main storyline quest found in the three main factions.
Kill 50 enemies with grenades.
Customise your mercenaries' equipment using the mercenary camp.
Buy drinks for everyone at a bar.
Get in a bar fight.