What are the requirements to acquire titles?

To be a USCF national master, you just need to hit 2200 at some point and then you have it for life.

If you're smart enough to make master, you're probably smart enough to know how to look up the requirements online. 

Achja, that's a great story. But this thread is about creating a resource for players ... to look up the requirements online. 

I agree with Achja.  I hardly ever look anything up on line.  I usually ask around.  When you have a large enough volume of responses, you can roughly figure out what a consensus answer is.  That consensus is usually a rough approximation of the truth.

Is it possible to become a national master with a chess variant rating of 2200 and having come in 1st, 2nd, or 3rd in 2 tournaments?

No. Titles are only awarded for over the board, regular rated play, in standard chess.

Does that mean I have to get 2200 in regular and get 1st in 2 regular tournaments?

If your flag is accurate, you would need to play at least 26 regular rated OTB games that are rated under US Chess regulations and get a 2200 rating on or after that 26th game for the NM title.

You don't have to place in any tournaments.

In england you have to be over 2k for two years with over 30 games per year. That seems way harder than just hitting 2k.

2200+ is pretty hard. Not a lot of players make it.