Here is a trick to make this easier:
You'll need 2 devices of the same game. For this one, I had a Windows 10 Laptop and a iOS device. This method will involve you using cloud saves to complete a game and add more completed games much faster.
1. (iOS) Get close to completing a game (only 1 or 2 moves left to complete a game). Exit out of that and go to "Awards and Achievements", and leave it on the app.
2. (Windows 10) Load up Solitaire and go to "Awards and Achievements". Then exit out.
3. (Windows 10) Go to FreeCell. It'll ask if you want to play the cloud or the local save. Choose cloud.
4. (Windows 10) Complete the game and exit out to the game's menu (home).
5. (Windows 10) In the game menu, exit out of the game by pressing the X on the bar of the top of the screen.
6. Repeat from step 1, but move a card back and forth each time now and try not to complete the game on iOS.