Here is the full list of all 12 Dark Lord Demo achievements.
Discuss your health with one of the advisors
Flog somebody 10 times
Conquer your first kingdom!
Yes, you definitely need a zombie wyvern. Totally safe!
Now the Manor belongs to the Cat
Make 100 choices
Meet the Merchant
Get a conflict between your advisors
Learn how to manage your manor
Upgrade the Cat's influence level to 10
Delicious cupcake and not poisoned at all
Why did you drink all these potions?