Here is the full list of all 30 Empire: Total War achievements. It takes around 200 hours to unlock all of the achievements on Windows.
Be hailed as a true conqueror: kill a million enemies!
Bring terror to the hearts of men: kill half a million enemies!
Use your duellists to kill twenty men on the "field of honour"
Successfully steal five technologies researched by other nations.
Draw the sword and march onwards: complete one quick battle.
Gain some experience of combat: complete one ranked battle.
Complete the main campaign game on the easy difficulty setting.
Use your assassins to kill, in unlooked-for fashion, twenty men who hinder your plans.
Complete the main campaign game on the hard difficulty setting.
Carve a bloody path to victory: kill a hundred thousand enemies!
Use treachery to best effect by turning against at least five allied nations and attacking them.
Complete the Road to Independence campaigns freeing the American colonists from British rule!
Ensure that thirty missions, regardless of detail or type, are successfully brought to a conclusion.
Use diplomatic threats to good effect by making gains from five separate negotiations.
Achieve victory in fifty multiplayer battles, dashing your enemies' hopes in pieces in the process!
Defend, sir, defend! Win ten multi-player siege battles when commanding the defenders of a fortress.
Attack! Attack! Attack! Win ten multi-player siege battles when commanding a besieging army.
As a commanding admiral, win ten multi-player naval battles.
Demonstrate your sense of duty and honour: complete ten multi-player battles.
Achieve victory in ten multiplayer battles, cutting a bloody path to greatness through your enemies' plans.
Win ten classic multi-player battles.
Have your natural philosophers and scientists research all the technologies available to your nation.
War sir, is a terrifying experience! Take part in a multiplayer battle.
Complete the main campaign game on the medium difficulty setting.
Subdue and hold all the provinces and regions in Europe at the same time.
Demonstrate outstanding ability, and capture one hundred regions.
Have mastery over all the provinces and regions in India at the same time.
Conquer or control all the provinces and regions in the Americas at the same time.
Capture ten regions, anywhere in the world.
Take one region by conquest, somewhere in the world.