SAM and VAC

So I opened up Black Ops 2 expecting to play it, but got sidetracked and minimized it. I then opened up SAM (Steam Achievement Manager) and unlocked about 3-4 achievements for another game I've been meaning to unlock. Afterwards, I realized Blops2 was open, so I re-sized it, and closed it. There wasn't any "Cheat Detected" message and Blops2 runs fine as well as the achievements I unlocked are still unlocked. Should I be worried? Any answers will be appreciated.