Sacred cheats:
Start the game with the /CHEATS=1 command line parameter. During gameplay press ~ to bring up the console window, then type in sys cheats 963 to activate cheat mode. Once cheat mode is active you can enter the following codes: 

Code     -     Effect 

cheat decap - Decapitates your character 
cheat lord - God mode 
cheat suicide - Suicide 
cheat teleport - Teleport 
cheat tp - Teleport

Pacman Dungeon:
West of the town of Faeries Crossing there is a hidden path in the woods that leads to a dungeon entrance. In this dungeon is a maze with dots you can "munch" and ghosts that will kill you in one hit, just like the classic arcade game Pacman. 

Gore: 
Go into the Sacred Folder, and Open up system.cfg, using notepad (It might be sys.config). Change the Violence level to = 1
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These are the cheats for the demo version. Just start the demo with the parameter /CHEATS=1 and press [~] while in the game to open the console. Now type in the following codes:

SYS CHEATS=1 - Activate cheat mode
CHEAT GOD - God mode
CHEAT RARE - Get rare items
CHEAT upgrade - All upgrades for the current character
CHEAT SETGOLD # - Set gold to #
CHEAT ADDGOLD=# - Add # gold
CHEAT ADDEXP=# - Add # EP
CHEAT SETLEVEL=# - Set level for current character (max 255)
CHEAT SETHEROLEVEL=# - Set level for current hero (max 255)
CHEAT FOGOFWAR - No fog of war
CHEAT DAMAGE - Set health to 1
CHEAT OBSERVER - ?
SYS FPS - Show Frame rate