In order to be sure that you can open the console, I'll give you the key to touch who differs from a keyboard to another.
Be aware that the cheats codes don't work in Nightmare and Trauma, in others words, you can only use them in the Daydream and Insomnia difficulties
Open the console and enter the following codes.
pkammo - Having 999 ammo for each weapon
pkweakenemies - Enemies have 1 HP
pkweapons - Have all the weapons
pkkeepbodies - Bodies stay at the appearance of the souls
pkgod - God mode
pkhaste - Move faster