Cheat Codes...
	Corpse stuck in a box...
	Secret Doll room...
	Secret Phrase...
	Steam achievements...

Go to the developer console by hitting ~ (the key above the Tab key) and type the following codes for the desired effect.

Code	Effect
bind x firstperson	Bind a key (x) to the command.
bind x thirdperson	Bind a key (x) to the command.
cl_drawhud 0	Remove the information on screen.
firstperson	Go back to first person.
thirdperson	See the game from a third person perspective.

Make a combine so small it can fit in a coulored box. Kill the Combine, and then it will enlarge to the normal size as a corpse. The corpse will get a body part or limb stuck in the box. Then it will glitch out, from kicking you in the groins to sinking through the floor.

In the Gm construct map, go to the garage place and look under the path at the side where you can see the hl2 symbol. Fly through it and you come to a small room where there is a couch, a sink a doll on a table and a notice board.

The secret phrase is "Rusty bullet hole" say this, and you'll receive the "Secret phrase" Achievement! Pretty easy!

Complete the following tasks to unlock the corresponding achievement. To view your achievements and stats in Steam, select "Community", then "My profile", then "View all my games", then the game and view stats.

Achievement	How to unlock
Addict	You have wasted a year of your life playing GMod!
Bad Coder	Experience 500 Lua programming errors.
Bad Friend	Kill 1000 friendly NPCs.
Ball Eater	Eat 200 balls.
Creator	Spawn 5000 prop.
Destroyer	Remove 5000 things.
Dollhouse	Spawn 2000 ragdolls.
Friendly	Play with 10 friends.
Half Marathon	Play on the same server & map for 4 hours.
Innocent Bystander	Kill 1000 innocent animals.
Map Loader	Play 20 different maps.
Marathon	Play on the same server & map for 8 hours.
Menu User	Open the spawnmenu 100,000 times.
One Day	24 hours of your life wasted.
One Month	One whole month of your life wasted.
One Week	One whole week of your life wasted.
Play Around	Play a gamemode that isn't sandbox.
Play Multiplayer	Play multiplayer at least once.
Play Singleplayer	Play singleplayer at least once.
Popper	Burst 1000 balloons.
Procreator	Spawn 1000 NPCs.
Secret Phrase	Say the secret phrase.
Startup Millenium	Start Garry's Mod 1000 times.
War Zone	Killed 1000 Baddies.
Yes, I am the real Garry!	Play on the same server as Garry.