Happy Tree Friends False Alarm

So far, I've been playing, and achieving Gold Medals on all my levels.
What you must do is:
Have all your HTF survive (If they do, and your timer is in the silver area, and they all get to the end, the timer goes back up into Gold, if you did good.)
Don't kill any HTF (As fun as it may seem to kill them, DON'T, because it depletes your timer, and drops it down real fast.)
Hurry the HTF (A great way to make them move faster than normal, is to put Fire right behind the last person, thus that should make them hurry, and move quicker.)
Analyze the area first (I highly recommend, you analyze the map, when it shows your path. If you don't analyze it, and your HTF move far ahead, they may be in DOOM. So analyze your area.)

That's most of the tips, I have to give on how to get gold on a level. If you follow the tips, and keep getting the Gold Medals, then the achievement should be a breeze.
Good Luck!