Q: Where can I view stats?
A: From the title screen, go to extras, then to stats, where it will list specific online and offline stats.
Q: Do [online] games still count if the other player drops out?
A: Sorry, no.
In a thread entitled "achivments" -
Originally Posted by monkeysmellsbanana
Halo 3 i really liked it especially in the end great game, stupid achivements. after playing awhile the game i found that bungie the only thing want u to be piss off. e.g bullshit stuff like sticking a player didnt die, spawn points, explosion radius. i hate online achivements.