The shot in this stage is fairly easy to pull off. Enter the atmosphere at the first planet according to this picture. As your pig pass through the first house, it can destroy the wooden blocks which kill the birds inside the first house.
Power Activation Point
Aim for the metal block at the top planet so that you shots can weaken the house that have the TNT.
First Shot Result
Your pig continues into second house after the shots get fired, set off the TNT if your laser didn’t. Killing all birds and you should be able to get the three star mastery.