If you've completed this on WP8, this will pop after completing a single game of Solitaire.
Aside from that, it's a standard cumulative achievement. Note that setting Klondike to Draw 3 only counts as one card flipped, so that is not an easy way through the achievement. If you want to click away to flip cards and unlock this sooner, Klondike to Draw 1 and Standard Scoring so the game doesn't end will do the trick.
Flipped cars are not counted until you win or lose the game.