I don't think a 'joy of scientific achievement' pill is possible. One could be made that would bathe you in it for a while, but your mental tongue would probe for your accomplishment and find nothing. Maybe the pill could just turn your attention away and carry you along, but I doubt it. Vilayanur Ramachandran gave a TED talk about the cause of people's phantom limbs - your brain detects an inconsistency and gets confused and induces pain. Something similar might prevent an 'achievement' pill from having the intended effect.

@Sharper: There's actually a school that teaches math (and other things) that way, St John's College in the US (http://en.wikipedia.org/wiki/St._John's_College%2C_U.S). Fascinating place.