It depends on what you call beat. To Complete Halo you should complete All Campaign missions, Some people also may want to try it on harder difficulty levels. There are also some skull you could find
foundation beat campain on heroic
the one u beat 2 death
have 2 beat it on ledgendary mode and have found the scarab gun
yes
wait for the next halo
It depends which Halo and which Fable. If you mean Halo 1 vs. Fable 1, then I'd say Fable, because Halo 1 doesn't have multiplayer on the Xbox. But, if you mean Halo 3 vs. Fable 2, then I personally like Halo 3 better. Halo 3, even after you beat the campaign, the game has longevity because there is multiplayer, whereas once you beat the Fable campaign, you're bored with it.
Halo 3 , rainbow six Vegas 2 and call of duty 5
u just nead skillige and kill the covenant bro!
About 2 or 3 days.
Yes
I am not sure if skulls are on the screen means that you have beat the campaign. It usually just means that you have beat the mission.
Depends what mission your stuck on. Go on halopedia they have walkthroughs of ever single mission