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