Do stats work if commands used?

If user uses console command, will it still grant him achievements and stats? 

I am thinking if I should implement wrapper to avoid granting achievements and stats to users who have cheated in the session/save. Just making sure that there is no such functionality in place already 

Yeah it will. Console commands aren't considered cheats.

I can make it so sv_cheats 1 causes them not to work though?

Sounds fair