I just want to verify that this achievement is indeed awarded for completing all basic tasks, and does not include epic tasks, before my guild starts saving up gold. I have found conflicting information and nothing definitive here on the official forums. This thread seems to imply that it does include the epic tasks Change request about Steam achievement but someone here says that it does not https://www.trueachievements.com/a230456/team-synergy-achievement So, what’s the official answer?
It works with just the Basic Tasks complete. Several Guild members got it the past two Guild Wars. I don’t think they were required to donate, as long as they just clicked on a task after all basic ones were completed, the Achievement popped.