This one is also story related and obtained by besting the giant neighbor a little bit after going into the basement during Act 3.
Step 1. Turn around and use an item to flip the switch on the wall.
Step 2. Go behind the wall, jump into toaster and land on the top green platform.
Step 3. Flip the switch, look down and land onto the circle wooden platform.
Step 4. Once at the top, break into the house and flip the switch. (Once you flip the switch, the floor will drop and umbrellas will fall from the ceiling. Grab it.)
Step 5.From where you started, to the right is a house. Below the house is some mini platforms, go to the top one and hit the red button on the console.
Step 6. Use the toaster again and float to the house the train flew into and grab the candle.
Step 7. Use the candle to light the firework laying in font if the giant.
Step 8. Use the toaster again and float to the left this time where the baseballs are. Push 2 baseballs in and when he is on BOTH knees your good. (If he is not on both knees, float to the toy crossbow directly in front of the baseballs to light the rope.)
Step 9. Use the toaster and float to the house on his back and enter.
Note: This achievement is known to be buggy for some players.