- SlashingArbiter
- |
- Exalted Legendary Member
You need at least two consoles because ODST only allows two players to play on the same console. You have to play the mission over XBL (which really isn't a problem if you have two consoles, just connect both to the Internet).
Achieving Endure single-handedly while protecting the other non-moving players will be difficult. The only way this could be feasibly done is if you can hide the three players in the same spawn room on Lost Platoon and then roam around in a chopper, killing everything yourself.
If you choose to get the achievement this way, good luck. However, it's way easier to find three other competent players to help you unlock the achievement.