I heard that you can achieve great things in MD, but you have to unlock them?? What does that mean?

To achieve an achievement you first have to find it on a clickable item somewhere in the realm and "unlock" or "activate" it for your character. Once you've done so you can check whether you meet the requirements to achieve your desired achievement at any time by clicking the book in the bottom left of the interface and clicking "check" under the achievement in question.

The greatest achievements in MD are having a good time and enjoying the results of your continuous work in having a good time (this point of view is hedonistic, of course, you assume that happiness is the end goal in life).

For those who are of a different opinion on what it means to achieve something, the game offers some visible means of progression for your character in the realm - such as a number of activity days (achieved!), a number of spelldocs acquired(!), of creatures upgraded to max and so on. These feats of your character are called 'achievements' and must be unlocked first in order for you to see them displayed nicely on your page; that is done in particular scenes. Activating them is a requirement for displaying them, but unlocking in itself does not mean completion. Therefore, activate them as fast as you can and achieve them at your leisure.

These achievements are standard, but some are of more interest since they reward Wishpoints. So get out there and achieve them all!