Regarding your question about HFGN, HFGN 1 only includes the first 7 games released for the HFGN series. If you are going for the full achievement score, you will need to buy the final 3 games. HFGN 2 was only released for Wii.
HFGN 3 is not a compilation of XBLA games, although it is a...