play quest first level. at the bottom of the screen bellow where you can see what colour bricks are coming next is a little button to bring the next line of bricks on the screen.
this level requires you to bring 15 lines onto the screen without crossing the line at the top. keep bringing lines onto the screen. you need to make sure when you bring the last line onto the screen there is at least one block at the very top of the screen.
If you have not got this achievement by the end of the first jungle level please read this solution to get both achievements on jungle level 2:
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