Can't WinG 50

Make sure you play on Expert difficulty, and play with the absolute dumbest strategy you can muster. Make as many matches as possible using free-floating tiles that do not need to be cleared, and just generally make sure your moves expose the lowest number of tiles possible. On expert difficulty, using terrible strategy, it should not be difficult to reach "No More Moves." Make sure you do not undo or shuffle, and let the puzzle end. Choose a different puzzle, repeat, choose a third puzzle, repeat. As the description says, these must be in a row. So, if you accidentally do the same puzzle twice, or if you just get a really good layout and can't botch your way to a failure, you're starting from scratch.

Can't Win G50:
Reach "No More Moves" three games in a row on three different puzzles.

This may not work out as a perfect solution, but it did work for me.
Choose the expert theme and start a puzzle. Choose either Holes or Complex for the first two.
make random matches and eventually you should be reach no more moves.
The next best bet is Ray, and the cheevo should pop.

In case you realize that this game may end, just exit out of the app, and start another game. It maintains the last known status. Happened to me once at 2/3 and my solution worked.

Credit goes to UltimusO

ENJOY!!!