I'm new to this, for the all achievements co-op record does every person on the run have to get all the achievements individually, or does everyone's achievements count together.

Sincerely, Penguiner

Complete all of the advancements End time when you receive the notification for the last advancement Each advancement must be gotten by at least one person, but you don't need any individual person to have every advancement. Runs may be segmented, but the server folder may not be used for other purposes between sessions.