Press CTRL and SHIFT and ALT and D while playing, then key in ~ (ABOVE THE TAB-key) to show the console window. Then, enter one of the following codes to activate the corresponding cheat function:

Code - Effect

df_buildinstantobjects - Instant construction
giveall - Get everything
help - Display help
money 1000 - Get indicated amount of money ( 1000 )
setmaxpopulation - Set minion population
showcommands - List commands
takeall - Take away everything
unlockglossary - Unlock the glossary