Happy Tree Friends False Alarm

For this achievement you must complete all the levels in a zone without your tree friends getting hurt.
I would say that the easiest zones to do this on are candy factory of ski lodge, but I would recommend ski lodge, as it doesn’t have any crushers.
While going for this achievement freeze all of your tree friends at the beginning and then scroll through the level clearing any obstacles.
Then carefully let them walk through it freeze them and make them go one at a time where necessary.

Note: The levels do not have to be done in order.