Windchill gems are made by combining 4 gems of the same color in a single line.
Glacier gems are made by combining 5 gems of the same color in a single line.
This achievement can easily be boosted in level 9. You can use 2 glacier gems for free. Besides, at the start you can already make one windchill gem with 4 yellow gems.
Note: You can receive more glacier gem power-up when progressing through the campaign. Using 3 or more of the free glacier gems in level 9 will not give you the gems back after you complete the level.
So start up the level, make a windchill gem, use one glacier gem. Then keep making combinations until you can make another windchill. Again combine with glacier. Now complete the level, and repeat 9 times.