The cheats for Fallout: New Vegas are the same as Fallout 3.
To bring up the cheats console during gameplay, hit the tilde (~) key.
Then, insert the cheat listed below on the left for the corresponding result on
the right.

Code                       Effect

addspecialpoints X       - Add indicated amount of Special Points (X=amount)
addtagskills X           - Adds indicated amount of Tag Skill Points (X=amount)
advlevel                 - Level up your character one level
GetQuestCompleted        - Complete current quest
getXPfornextlevel        - Gain one level
help                     - List all console commands
modpca Y X               - Add indicated amount of points to your S.P.E.C.I.A.L.
                           stats (Y = stat type, X = amount)
modpcs Y X               - Add indicated amount of points to your skills
                           (Y = stat type, X = amount)
player.setlevel X        - Set player level (X = level)
player.additem 000000F X - Get indicated amount of caps (X = amount)
removefromallfactions    - Remove player from all factions
rewardKarma X            - Add indicated amount of Karma Points (X = amount)
setpccanusepowerarmor X  - Toggle Power Armor use (X = 0 or 1)
setspecialpoints X       - Set Special Points (X = amount)
settagskills X           - Sets Tag Skill Points (X = amount)
tcl                      - No clipping mode
tmm1                     - All mapmarkers
tdt                      - Toggle debug display
tlv                      - Toggle leaves
tgm                      - God mode
ShowBarberMenu           - Change all hair options
ShowPlasticSurgeonMenu   - Change all face options ShowPlasticSurgeonMenu