got all the basics.. the "hard" ones appear to be the leveling up.. I have played two nights and only got to level 6.. while I already beat offline while getting the silver commando trophy.. appears it may take awhile to level up..
I have all except the level 15 and level 25 rank ones. I'm 13 now. The activating all 3 power ups 10 different times in online matches is across any online matches you play. Doesn't have to be in one round (that would be pretty hard). It works even if you're in a game with mostly bots as long as it's still online. You can rank up and get the 20 kills with each weapon offline too. That's good for the cab gun. It's hard killing people with that online.