As you stated you are having issues with Achievement 4, here's i made an easy sample for you so you don't have to go through each and everything

Achievement 4 is based on applying markdowns

Some of the common mark downs are as following:

1. Applying Bold to do it all you have to do is add two sterics at the start and at the end of text like this ** hello this is Pakistani CR and Greeter ** remove spaces and you will have it.
2. Similarly Italic which can be done by adding another steric at the start and at the end of text like this *** hi *** just remove space after starting steric and before ending steric
3. To apply table it gets difficult for many new users its like
   Coloumn 1 | column 2
   --|--
   Hello | hello 2
4. The fourth common mark down is headings all you have to do is add # heading now here you dont have to remove the Space :)

I hope it might help you.. let me know once you are done with applying Achievement 4