Enter these cheat codes via the console which can be enabled by running the game with the "-console 1" parameter, and can be accessed in-game by pressing the "~" key on the keyboard.
Cheat codes:
god - God mode
notarget - Invisible to everyone
noclip - No clipping mode
giftxp ### - Get ### experience points
impulse 101 - Most items and weapons
blood ### - Set blood to ###
give ### - Spawn an item, where ### might be
item_i_written
item_g_keyring
item_g_eldervitaepack
item_g_bluebloodpack
item_g_bloodpack
item_p_gargoyle_talisman
item_p_occult_heal_rate
item_p_occult_passive_durations
item_p_occult_thaum_damage
item_p_occult_dodge
item_p_occult_blood_buff
item_p_occult_experience
item_p_occult_strength
item_p_occult_dexterity
item_p_occult_obfuscate
item_p_occult_presence
item_p_occult_lockpicking
item_p_occult_frenzy
item_p_occult_hacking
item_p_occult_regen
item_p_research_lg_firearms
item_p_research_lg_stealth
item_p_research_hg_dodge
item_p_research_mg_melee
item_p_research_hg_melee
item_p_research_lg_dodge
item_p_runwonted_rules
item_p_research_mg_brawl
item_p_research_hg_firearms
item_p_research_mg_finance
item_p_research_mg_security
item_p_research_hg_computers
item_p_research_lg_computers
item_g_astrolite
item_g_wallet
item_m_money_envelope
item_m_money_clip
item_m_wallet
item_w_unarmed
item_g_lockpick
item_a_body_armor
item_a_hvy_leather
item_a_lt_leather
item_a_hvy_cloth
item_a_lt_cloth
item_d_holy_light
item_w_tzimisce3_claw
item_w_baton
item_w_osnndotnet
item_w_tire_iron
item_w_severed_arm
item_w_torch
item_w_sledgehammer
item_w_occultblade
item_w_knife
item_w_katana
item_w_fireaxe
item_w_fists
item_w_claws_protean5
item_w_claws_protean4
item_w_claws
item_w_bush_hook
item_w_baseball_bat
item_w_flamethrower
item_w_thirtyeight
item_w_uzi
item_w_supershotgun
item_w_steyr_aug
item_w_remington_m_700
item_w_mac_10
item_w_ithaca_m_37
item_w_deserteagle
item_w_glock_17c
item_w_crossbow_flaming
item_w_crossbow
item_w_colt_anaconda
item_g_lilly_diary
item_g_drugs_pill_bottle
weapon_physcannon (Crashes the game)
quit - Exit to the desktop
cl_showfps 1/0 - Show or hide the FPS counter on the top right corner of the screen
Stats cheating:
vstats get animalism 5 - ANIMALISM discipline is maxed out
vstats get auspex 5 - AUSPEX discipline is maxed out
vstats get celerity 5 - CELERITY discipline is maxed out
vstats get dementation 5 - DEMENTATION discipline is maxed out
vstats get dominate 5 - DOMINATE discipline is maxed out
vstats get fortitude 5 - FORTITUDE discipline is maxed out
vstats get obfuscate 5 - OBFUSCATE discipline is maxed out
vstats get potence 5 - POTENCE discipline is maxed out
vstats get presence 5 - PRESENCE discipline is maxed out
vstats get protean 5 - PROTEAN discipline is maxed out
vstats get thaumaturgy 5 - THAUMATURGY discipline is maxed out
vstats get charisma 5 - CHARISMA skill is maxed out
vstats get intelligence 5 - INTELLIGENCE skill is maxed out
vstats get dexterity 5 - DEXTERITY skill is maxed out
vstats get wits 5 - WITS skill is maxed out
vstats get automatic_soak_successes 10 - Gives permanent +10 stats to each SOAK abilities
vstats get automatic_str_successes 10 - Gives permanent +10 stats to MELEE and UNARMED abilities | 
