You can beat Attacus without healing once and using two or three paradigms.
Raks were jsut annoying 'cause they tanked all your shit until you staggered them.
The one guy can be poisoned for 5 stars ez. You just might get unlucky and he'd cancel it with that aura thing before it starts doing dmg, but that'd just take up some time.
Neochu is only hard 'cause everyone wants that Growth Egg early (Post-game all these missions are ez.)
Hardest one I had 5 starring was that Shell lizard thing at the beginning of the Titan trials. Just because the target time was like 40 seconds and it took about 30 just to stagger him.