Across the Frozen Pond is an achievement in Run 3.
If you want to get this achievement easily use the Bunny. The Bunny can easily jump over the first wave of ice tiles but be careful because when you land the second wave it can be very close so jump right back up into the air.
You can also use the Student and change gravity to the other side of the level. You can also just hold till the last second and jump over all of the ice tiles.
The Pastafarian also works, although not in the suggested characters. Just use the bridge instead of the ice tiles and keep reinforcing the bridge for maximum free ground.