To get anything but you have to pay
First press D, C, R and L and Z. This should result in a menu. This menu will show you ground units upgrades skills and special powers, and spells.
Building Cheat Disc
To get the Building Cheat Disc that allows your to produce faster, play the first level of Zerg Brood Wars. After you save the first hive run over and save the second hive. After you save it go down and hiiden in a corner is the disc.
Strategy for the Protoss
Begin by making 7 probes and then make a pylon to house more units. Then make more probes until you have a whole swarm of them and then you will gain money fast. Now it's time to make 3 more pylons and then make 4 gateways. At each gateway make 1 zealot. Use your 4 zealots to attack the enemy. This will keep him occuppied for a while. Then make a cybernetics core and when its done make upgrade longer site range for your dragoons units. Make a lot of dragoons and remember to construct more pylons if you can't make any more units. When you have around 20 it's time to attack and if that doesn't work just keep on producing more dragoons until the enemy is down.
Press C-Up, C-Left, C-Right then C-Down and you should have unlimited money.
Repeatedly press B on a structure to build it faster.
In episode terrain, play level 04, "The Jacobs Installation." You should start out in a room with one door. Bring Raynor and only Raynor through the door and through the hall (don't open any doors yet). There should be a missle wall trap at the end of the hallway, don't destroy it, instead go through the hallway at the top right of your screen. Down the hallway there should be an orange civillian. He will ask for mercy and says he will give you a cheat if you spare him. Go on past him without killing him, use the portal and activate the security cameras and go back past him. Now, bring the rest of your force and continue with the level by going through one of the top doors and he will tell you he is grateful for you not killing him and he gives you the cheat.
Open tech tree
On protoss level 06 episode III, go down the starting hallway, fight off the zerg, but don' t go down the stairs. Go down the hallway and left from the stairs. Your advisor tells you that you've trod upon sacred ground and you will be granted a cheat if you leave. Go back a short distance and you should be rewarded with the open tech tree cheat.
Fog of war off
On protoss level X03 begin the level and wait a while, some corsairs should fly in with some shuttles, they will pass a little island with a white flag. Get any unit to walk on the flag and your advisor informs you that you have located "the flag of knowledge" and you are granted the cheat.
Complete all 56 missions in the episodes.
Unlock all research
Episode 2, Zerg Mission 5, The Amerigo. Have Karrigan walk to the left of the cell with the animals in it.
Strategy for the Terrans
Train as many SCV units as you can, then build at least 5-6 Supply Depots. Continue to train SCV units until you have around 20-30 of them. They will harvest the crystals at a good pace. Build a Refinery and command 2 other SCV's to harvest the ore. Then build a Barracks and an Engineering Bay. Train 10-20 men and they should be able to defend the entrance to the base. Upgrade whenever you have the crystals and the vespene gas to spare. Build Missile Turrents all around the perimeter of your base while you build an Academy, a Factory, a Starport, an Armory, and a Sience Facility.
Once you have the Factory built, train 2-4 Goliath's to help defend to entrance. Now you can build all the add ons. (E.G.) The Comsat Station and the Nuclear Silo for the Command Center; the Machine Shop for the Factory; the Control Tower for the Starport; and the Physics Lab along with the Covert Ops add on for the Science Facility. Now build 8-12 Siege Tanks and upgrade the Siege ability in the Machine Shop. Remember to keep upgrading. Put 4 Siege tanks (in Siege mode) at the entrance of your base and put 4 Goliaths in front of the Siege Tanks. If done correctly, your base will be impenetrable by the enemy forces.
If you are still paranoid that it's not enough, then you can build Bunkers in front of them. If you run out of money then you can take up to 8 Siege Tanks along with 4 Goliaths with an SCV to hunt for more crystals. If you spot the enemy immediately go into Siege mode. The offensive attack on the enemy should be the same way. If you fight the mission the same way, you shouldn't lose that many men! Remember to use the Siege Tanks as guards when out of the base and remember to build Supply Depots when needed.