Here is the full list of all 26 The Guild 3 achievements.
Become the Sovereign
Reach the title Patrician
Equip your character with a horse cart
Be elected in a office
Produce your first product
Marry
Play on the Hansa map
Take part in multiplayer
Drink one Guntram's Brew
Have 50 employees at once
Play until late 1517 (Oct. 31, 1517)
learn the skills DarkSecret, Spellbound and Occultism3
Death through execution…
Earn 10,000 winning points in difficulty level "normal”
Have 100 employees at once
Have 24 business buildings at once
Have 1,000,000 coins
Play until the year 1800
Be in feud with 10 other dynasties at once
Play until the year 2000
Earn 25,000 winning points in difficulty level "hard”
Earn 50,000 winning points in difficulty level "impossible"
Become Sovereign without owning a single business building all the time
Have 10 secret lovers simultaneously while single
At any one time, carry 10 wheat breads & 10 roast beefs in your inventory
Be a judge at your own trial