Don't be fooled by level of difficulty
After reading the forums it seems to me that the estimated difficulty of 2/10 and time for 1000 less than 5 hours are way off the mark. If you read the challenges topic in the forum you see comments like “took me a ton of tries”, “I thought it was going to be a breeze” and “not worth the aggravation”. I think folks are surprised at the difficulty only because from the Roadmap it sounds like it will be easy. I have often found roadmaps to be very misleading when it comes to achievement difficulty and estimated time.