In addition to ABouncingSoul's guidline, there will be a cheap way to attain this achievement------ I am using Lumia 800.
Basically the strategy is like this: play action mode until level 4-5, then let the orange bar fell down lesser than half.... then start making matches..until speed +1400.... starting from then, press and hold the back button of the windows phone----> the screen will zoom out and the game will be hold. then , plan your next 4-5 moves (some time if desperate only 1-2 move is available) then when you return to the game, you will be back to main menu, continue the action mode and do the moves you planned . then hold the back button again and plan.
keep looping this will let you filled up the orange bar of "Speed + 1400" gradually and once you the screen flash, achievement pop.
but sadly speaking, i tried to use this method for "Faster than light" achievement but fail. Dun know why. If someone knows, please tell me. Thanks.