This is a very simple guide provided with pictures on how to get the "Break a certain thing" achievement in Suicide Guy.
Go to Level 7
This is actually a very simple achievement once you know where the egg is located. The location off the egg is in level 7.
Get to the Roof
When you spawn and look at your right side, you will see these 2 movable blocks highlighted in the image.
Move those to blocks in a certain position so you can reach the top of the wall, like here.
Once you climb on that wall, you'll see the egg in a distance.
Once on the Roof
Now all you have to do it run towards it, and push it over!
That's how to get the achievement!