Step 1: First you have to complete the game at least once but probably twice to get all the Gems and purchase all the bonuses with them in the Store. Buy them in the Gem tab in the store.You need all of them and they are all very useful.

Step 2 (most important): Start a game with all the gem upgrades and learn ALL the 5 skills in the Learn menu to a value of at least 7500. DO NOT BUY anything from the store initially. This is very important because you cannot learn anymore after 8500 in any skill so we will first learn everything we can in school then boost the skills with the items later on.

Do not worry about going into debt. At the end you will recover all your money and have a lot of extra and nothing to spend on.

Step 3: Do events serially and get rewards and money. These will give you story achievements.

Step 4: When you have a lot of money buy the items in the shop.

Step 5: Superstar achievement. Do one activity from adverisements page 1, then page 2 and so on untill you reach the last page. There you have to do the last 2 to get the Queen achievement. Always use coins to get maximum popularity. Then repeat the same thing for songs and movies. Having high skills, these will be done imediately.

You might need to restart and do the other steps above again to get here, depending on how much you take, but you can get all the achievements in one playthrough depending on what you focused on your initial playthrough.

DONE! I hope you have fun with this gem. I personally loved it.