Bluey: The Videogame

At the Heeler House, go outside and to the side of the house. There you'll find a soccer ball and 2 nets. Pick up the soccer ball to collect it, then respawn it from the box nearby, drop it and press to kick it into either net. It will respawn in the centre, repeat twice more for the cheevo

Missable - This one can be gained in Episode 1 of the game and is missable, you need to go around to the back of the house to where the two goals are, pick up the football to collect it, then head over to the box against the wall and select the football, drop it then using kick the ball into one of the nets, ball will respawn in middle of pitch, score another two goals and achievement will pop.

This guide will walk you through this achievement and all of the other 21 achievements in under 2 hours. Hattrick achievement starts at around 12:57 into the video. All achievement timestamps are shown in the video Description.

You will be able to gain this after completing episode 1 at the Heelers House, because the backyard is blocked off prior to that.
After episode 1 go to the backyard and head down and around the side of the house. You will find football goals and a collectible football. Pick up the football and it will add to your sticker book and then after that use the small bag of toys at the back between the two goals and select the football from it, it should now spawn in the centre. Then simply pick up the ball and place it in one of the goals, it will then reset back to the middle. Do it 3 times for this achievement.

If you need more help with this my video guide below will show you how to do it: