Originally Posted by FirstFightDown
Can someone tell me what the best way is to get a lot achievements out of the way, how many people do you need and what gameplay is recommended.
Play with 4 people to do the campaign on Legendary. At least 1 true Halo Verteran who can unlock the skulls achievements also. You'll need to do the same thing for multi-player. Get a team together and work together to get them.
Start adding people who want to co-op and play it.