On PC, it is technically possible to find "Trainers"—third-party software that injects code into the running game to modify memory values. These can be used to grant infinite ammo, god mode, or instant level-ups.
"Freelancer Mastery Tracker"
There is no button to press that gives you Level 100 Mastery. Anyone selling such a "cheat" is scamming you.
This single item turns the hardest Prestige Objectives into trivial speed-runs.
When players search for "Hitman 3 Freelancer Mastery cheat," they are usually looking for one of three things: console commands, trainers, or file manipulation.