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