Family Game Night

You can do this achievement in solo play, or do it with a friend online. Simply remove a block facing Mr. Potato Head, then remove the one in the middle as well to make the tower give away and lean towards him. Make sure you remove the blocks about 3 or 4 rows from the bottom so that the tower will fall on him.

You may also grab a block on the back of the tower and pull the block out, then again at the side to make the tower spin around, and fall over on him in one turn.