For this achievement you will need to get all 3 stars on every level for every category in play mode. Depending on your skill level with the minigames, this may not be as easy as it sounds. If you don’t manage to do it the first time, don’t be discouraged because these minigames can be quite tough at the end levels. You should only really begin to struggle in the later levels because that’s when each minigame gets harder and you’re given less time to choose your answer. If you need more time than you’re given in order to work out the answer to a question, you can pause the game and work it out, then continue and select your answer. If you are struggling at all, the best advice I can give is to practise, and you’ll probably be able to learn a few of the answers (though questions will be different each time, some can be repeated), and also find the easiest way for you to complete the minigames. This achievement may sound daunting at first, but as with other achievements, if you stick to it and practise enough, you’re sure to get it.
For help with strategies, check out -This- thread.