Cheats:

When you are in the mission type: magic

Then use following commands:

++ = Win curent mission
++ = Lose curent mission
++ = Unblock all missions & all medals
++ = 100.000 Credits

Type: DUSK in freeplay and a random event will happen (NOTE: Its recommended to have a very good computer to use this cheat!) 

-All missions + rewards (100% completion):

Open your file "campaignprogress.xml" located in: "\sixteen tons entertainment\Emergency 4\Data\Save"

Then replace the file by this one: (if you didn't find it, just put this one...)

Click Here To Download The File (right click -> save as....)

Now save it, and done! You are on 100% completion of the game...