You need to clear all 5 worlds without using a continue to earn a star for every world.
I highly recommend you earn this following achievement first before even attempting this.
By unlocking the Private Detective achievement you will unlock a new blast power that can destroy a lot bricks. Also using the power resets your orb back on to your wand ready to launch again at a slower speed.
You can buy more lives from the shops hidden behind doors to help make this easier. Lives cost 85 coins each. You can also find lives hidden under bricks throughout many levels. You should have a nice constant stockpile of lives. I'd recommend having at least 10 to 20 lives on hand in case the levels don't progress well.
If the orb's speed is getting too fast, attempt to either exit into a bonus/shop door and when you return to the level you start back on your wand ready to launch again at a slower speed.