So for this one, I was confused about how it worked, but basically you want to make many consecutive chain matches (matching gems really fast) and you'll notice that the number in the purple circle under your score, has a multiplier number. To pop the achievement you need to get the x5 multiplier!
In this clip, I managed to get the "Speed + (number)" in the upper left corner in which:
3-gem match = 100pts
4-gem match = 150pts
I would say first priority is going fast and if you are able to, match 4-gems and up and pray for a good chain reaction lol. Here's my clip, it took me several tries to get it:
Sorry, this Game Clip has been removed