In reply to HitMeOnMyPeja: [Can someone explain. Get 10 chests in a SINGLE helltide? I opened 12 and didn't get achievement. Does it have to be in same zone? Same hour? What if helltide starts at :30 and spans next hour?]
Are you trying to do it before you unlock the last tier? I tried to do it early and couldn’t get it to work. Finally got it last night. I’m not sure, but you may also need 10 different chests. I tried to mix them up on that theory, but cannot confirm it is needed.