Here is probably the only .xml hack that still is undetected, what you have to do is to put the file in C:\Program Files\Electronic Arts\Crytek\Crysis 2\gamecrysis2\Scripts\PerkInfo (Create if you dont have and paste the file).
Start the game and get one dog tag and you will get the radar, 2 dog tags jammer, or laser beam thing, 3 dog tags cepth gunshit or armor thing, basacly kill 3 guys and get their dog tag and you will have al the killstreaks
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Hack that i was using for unlimited ammo, wallhack and unlimited energy:
Do what says in the comment to push buttons