This achievement is so easy. Just grab three random people with ODST. 2 of my three helpers sucked and we still got it.
well you have to also grab people who aren't d-bags. We tried last night and some kid kept betraying us becasue he thought it was funny and made one of the guys quit after we where half done. Needless to say not fun, and no achievement.
if you guys need any of the vidmasters add me. Send a message first or i probably wont know who you are.