All of them.
I don't know how to summon Slifer before he's able to summon Ra without killing him.
The 4000 Damage is possible I guess, but same problem as above.
The 1000 LP is also a problem, I assumed to not summon anything until my LP are at/under 1000 LP, but he always kills me. His usual monsters are too weak so they can't destroy mine, but as soon as he pulls Ra out, I lose.