Just got Dead Boy on my 2nd hard mode run. Got Missing No. on an early floor and my Dark Room build gave me Tiny Planet on Azazel which seemed pretty good actually and I had saved an Emperor Card to get me to the boss.
My Sheol build had Technology 2, Tiny Planet and Anti-Gravity but was actually super powerful.
Also seems like you can't unlock character specific achievements as Judas' Shadow? I transformerd from Isaac into Judas' Shadow in my first hard mode run and didn't get anything for beating Mom's Heart.
Edit: Character screen shows me as having beat Mom's Heart with Judas but I didn't get the secret.
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Originally Posted by RockerguyAA
So I've got about 30 hours into the game so far, but have yet to unlock the dice or ??? or do any challenges etc... What do you guys think I should be working towards right now? From what I've gathered I should probably be trying to unlock the dice which means I should unlock ??? which means I have to beat Mom's Heart 10 times? Also, I haven't unlocked any levels past Mom's Heart, though I did beat Satan twice after taking a ladder down from the Devil's Room after beating Mom's Heart.
I'd say try to beat Mom's Heart until you get It Lives and then try to beat Satan with every character.