Sega never gave their old megadrive sonic re-releases any hard achievements but that list doesn't sound too shabby, watch as most sonic fans will net them in 1 to 2 days. I also like how it confirms super sonic in all stages.
I will not mind if super sonic has the boost since you got to get into super mode to use it, plus in sonic 2 and 3 he was pretty quick anyway for those kind of levels especially emerald hill where he could run across both acts in under 30 seconds easily. long as they make him look good and do the classic running lean thing at high speed.