i did this on the first jungle level. i aimed to do it with reds as there seems to be more of them. just remove as many blue and yellows as possible to get a solid red brick wall. also keep pressing the little button at the bottom of the screen (just bellow where it shows you what coloured blocks are coming next), this button will bring the next line onto the screen.
8 blocks fit on each line so you need 5 full lines of red (or your chosen colour) before removing them. i just kept bringing more blocks onto the screen removing blocks that weren't red untill i filled the screen and then removed them.
Thanks to some very quick feedback from MICKERR
we now know these achievements
DO NOT STACK!! they must be achieved one at a time so keep a count of your bricks!
Thanks to further feedback from Musquito
i now realise i overlooked something quite obvious, although i did not achieve it by this method. if you manage to fill the screen (to the top line), only using your colour of choice and then clear them for the huge buster achievement you should also unlock this achievement at the same time: Solution for Close Call in Collapse! (WP)
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