I don't know if some of you noticed this, but I'm actually finding some parts of the achievement is pretty odd...
1. Complete 150 Rounds in Node 1 -> 300 energy
2. Complete 100 Rounds in Node 2 -> 300 energy
3. Complete 75 Rounds in Node 3 -> 300 energy
A total of 900 energy to complete all these achievement considering you don't mess up.
I mean these stages give much lesser exp (both player and hero exp) and gold compared to regular stages... plus I've obtained Lulu from getting 300 signed discs when I completed around 80~90 rounds in Node 1. Makes me wonder if I should actually spend energy more energy on these stages. The 200 gems and extra Lulus is really good in a way. What are your thoughts people?