I did it on easy mode, but Crab mode coming out is completely random. It comes out as the.. third form I believe.
As for MUA2, there's currently no patch, but alot of the achievements have methods for working. Like for example the achievement in beating 12 bosses without dying, I had to redo every boss with a second profile-less controller playing. If you need any help with the achievements, just ask! I'll be happy to help any way I can.