http://www.newgrounds.com/portal/view/469482

Scout - Find secret area 1:
Press tab for the "No cheating bud" screen. In the bottom left corner there is a small gray movie image. Click it.

Observer - Find secret area 2:
Level 20: Click the cats left eye (your right).

Committed - Find secret area 3:
Level 22 - Click the Start button on the DS.

Too Much Free Time - Find secret area 4:
Level 30 - type sbc in password box.

Insane - Find secret area 5:
Level 30 - click N/A under the spear in the top right.

The secret ammo box - Find the secret ammo box in level 4:
Go to the right in the beginning and fall down. Keep goin to the right, you'll see the secret box.

Weebl's Secret Island - Find the hidden Island In level 13:
Go up and right, follow the dots. Click the cup.

Wrong turn - Find the secret area on level 16:
Go left until you see a golden cup. Click it.

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 / Go left till you find a golden cup and click on it.
17) free
18) slam
19) flat
20) mouse - Click the cat's left eye.
21) circle
22) logic - Click the Start button on the DS.
23) ground
24) narrative
25) language
26) 351
27) pinnacle - Do the puzzle
28) hedgehog
29) yo
30) Pick one or the other (takeover for Takeover medal or revive for Revive medal)
-Type sbc in the password box
-Click N/A under the spear.

oops...thanks MasterX  (broken image removed)