So leaving aside the "lead into gold" part, an alchemist is one who searches for wisdom (you can decide the immortality part for yourself), one who changes things. Hopefully from bad to good or at least a bit better.
As an alchemist my goal is to take the insanity and chaos, not to mention the mundanity, of life and create something meaningful for myself. Or perhaps rise above is a better way to put it. In other words to transform it in some regard.
What do you think? Possible? Inpossible? Let me hear from you.