on the storyline there is 51 missions
and 18 side missions
Rumoured to be 273 missions and 3 endings, but some say under the stats menu there is only 69.
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You can do missions for Bonnie MacFarlane in Red Dead Redemption, that is all.
i have both and i believe red dead redemption is a lot better as on mafia a lot of the missions are very similar whereas there is a lot more variety in red dead redemption. also red dead redemption has a much better and interactive environment
do your missions
Do your missions.
yes
No, in undead nightmare you basically kill zombies and do zombie missions
you have to do missions
do the missions which it says in your journal
there is no cheat for it, you must do the missions for it in your journal
you must do more missions until it unlocks
If you want to be able to do this you need to complete the story missions on Red Dead Redemption and eventually you will unlock the higher levels of dead eye which allow you to use the X's.
there are no proper missions but there are mini missions such as killing the man who killed John