Okay! Here we go!
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Newgrounds Portal Defenders:

I will tell how to get SECRET medals for this, OKAY!

Bom-nivore - Kill BoMtoons
Horde Fighter - Kill 20 zombies
Creditz - Sit through credits
Doer of radical wrong - kill the 2 RWD animators
Juggler - Get a combo of 30 or higher
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Alkie Kong: They Have a guide, read the description.
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Thing Thing Arena: Tells you how.
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Deliver That Fulp!:

Just Can't Wait - type deliver from the menu

Can't Concentrate - Deliver without taking the pills

Confuzzled - don't do anything

Filthy hands - deliver baby without gloves

Goodbye world - type suicide

Hercules - type "pull" instead of "pull gently"

Play Again? - type play while already playing

Speedy Delivery - deliver in under 20 seconds

That's Disgusting! - deliver without blindfold

Wrong way - type push

It's a Boy! - successful delivery ( Take gloves, wear gloves, take pills, take pills, take blindfold,blindfold tom, pull gently)

You're too slow! - do something, then wait for time to expire.

xyzzy - type xyzzy

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Newgrounds Pass 3

1.operator
2. script
3.patch
4.roses
5.properties
6.lantern
7.faint
8.autopsy
9.aidem
10.lovely
11.log
12.benny
13.before
14.lolcake
15.knee
16.workspace
17.free
18.slam
19.flat
20.mouse
21.circle
22.logic
23.ground
24.narrative
25.language
26.351
27.pinnacle
28.hedgehog
29.yo
30.sbc

Secrets for medals:
Any Level- Press TAB to activate the anti-cheat system, and click on the movie-symbol on the bottom left corner to get a Medal.

Level 4- Move left, and fall on this first gap while moving to the right (in the air). Then proceed to go all the way to the right, jumping over any gaps. Get the golden box for a Medal.

Level 13- Move northeast all the way. You'll soon find some type of arrow. Keep following it, and click on the trophy for the Medal.

Level 16- Move left on this level, and click on the trophy.

Level 20- Click on the cat's right eye (since he's staring directly at you, it's supposedly his left-eye, but...) to get a Medal.

Level 22- Press the Start button on the Nintendo DS.

Level 30- Click on the N/A under the spear picture to get a Medal.

Super Password: When you get all achievements, press Spacebar to activate the Achievements Menu. Note that each achievement has a letter on it. It tells you of the super password. To use it, go to the Options Menu, and click on Super Password. Digit q5v48e to activate a silly yet funny scene.
NOTE: YOU DON'T NEED TO GET ALL MEDALS TO WATCH IT!

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Fear Unlimited Issue2: Tells you.

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Well. That's a wrapup for this.

Here's another good guide,

http://wylina.newgrounds.com/news/post /285955