Here are the ways to earn every medal for the game -Gretel and Hansel-
If you have any questions or comments, just comment to let me know. I hope this helps.

MEDALS:

-5 points-
BABY STEPS: Start the game and walk.
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-5 points-
SLIGNSHOT BREAKFAST: Take a shot with the slingshot. Not very hard is it?
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-10 points-
BITCH SLAP: Near the end, slingshot the mom in the face to slap that BITCH! She deserves it.
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-10 points-
HONEY HORROR: Slingshot the branch on the cliff, which is to the left side of the house, and use it on the beehive. When the beehive falls, stand on it to get stung to death.
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-10 points-
SUCKED DRY: Stand on the giant spider's shadow and get killed.
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-10 points-
TIME IS RUNNING OUT: Slingshot the clock on the bedroom wall and walk over it to get it.
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-25 poitns-
ELECTRA COMPLEX: Slingshot the dad a couple of times near the end.
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-25 points-
GRETEL UNIT: Okay this one pissed me off. Not only is it boring, but it's a waste of time. The thing you must understand is that YOU DON'T HAVE TO TAKE 200 SLINGSHOT SHOTS IN ONE GAME. Just shoot things like a maniac throughout the game and you'll get it eventually. If not in one game, play it again and shoot things...alot.
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-25 points-
HERE IS MOMMY: Get the clock by shooting it off the wall. Then kill Hansel, and after you respawn, the minute hand will be near the door. Once you get the minute hand, head outside. Go to the well screen and shoot the butterfly. It will drop the hour hand. Then click on your inventory and then click on the clock. Set the hour hand to 4 and the minute hand to 6. It will unlock a key. Head back to the bedroom and use the key on the door. Mommy will chop through the door and show her deep love to Gretel by chopping her to death.
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-25 points-
KAIN: Kill the moron by shooting him like 6 times. Hansel will go into seizure mode and die. You're such a great sister. No really...you are.
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-25 points-
KISS THAT CYUKE: Kiss the black rabbit by interacting with it. You will die from old age if you kiss it for 30 secs.
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-25 points-
PECKING ORDER: Be careful with this one, the crow might fly away. Walk to the left side of the well and wait for the crow to hop down to you. Interact with it and it will peck your eye out.
Remember to kill it and roast him over an open fire after...
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-25 points-
PEST REMOVAL: Collect all the acorns: one behind the stump in the house screen, one behind the stump in the well screen, and one behind the boulder in the spider screen. While you are there, get the valve near the boulder. Go to the front of the house, press the button, and put the valve in. Crank up the cage and put the acorns under it. The squirrel will appear on the cliffside. Shoot it and press the red button. The stone will fall out of its tiny hands, once the cage falls down, and it will land by the cage. CONGRATZ! NO MORE FREAKING SQUIRRELS STEALING YOUR STONES!
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-25 points-
THE FLAMER: At any time, go back to the bedroom, take Hansel's crappy drawings, and put them in the fireplace. Shoot the pipe above the fireplace and the sparks will create a fire. After that, stand on the flames for 6 seconds. When you start burning, Hansel will start dancing. He thinks it's a game...
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-50 points-
CLOCKSPERT: On the clock, place the minute hand (the long one) on 6 and the hour hand (the short one) on 4. What a hard puzzle that was.
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-50 points-
GET STONED: You will find the joint under Hansel's pillow. Use it on the fireplace to light it, then get really really high!
Actually, unfortunatelly, just collect 10 stones to get this medal.
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-50 points-
POP, ROCK, AND DROP IT: When you are being chased by the parents, click on the stone icons that appear on the right side. Click on all ten to earn this medal.
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-100 points-
GRIMM MASTER: Get killed by all the animals and by fire in one game. Wait 'till the credits are done and then the medal will pop up.

*ONCE YOU GET THE GRIMM MASTER MEDAL, AN EGG WILL APPEAR ON THE SCREEN. IF YOU CLICK ON IT, GRETEL AND HANSEL WILL HAVE MAKS! A RABBIT MASK FOR GRETEL AND AN ASS FACE (DONKEY) MASK FOR HANSEL.*