Yes, this achievement isn't that hard but with enough practice you should have it. A few pointers on this one.
1. Be relaxed- It really helps, if you're failing at a part a certain number of times, take a break loosen up and calm down, this really helps. Sing it too, it helps relax as well.
2. Watch out for the ending!- At the end of the song near the 3 minute mark in this video there is an orange note followed by a pull off of a blue and yellow note. Make sure you watch out for this, because if you don't you will be upset. (Credit goes to youtuber xxfrosteex)
Keep on trying and trying and you'll get this eventually with enough practice.