What racial boons are out there?

[Blastoguy]

Kind of in the mood to play a catfolk/dhampir/undine/oread.

Any of those available via boons yet?

How does one go about acquiring a boon?

[Paz]

Catfolk: no
Dhampir: yes
Undine: yes
Oread: yes

Boons are generally available to be won, or earnt by volunteering/GMing, at cons with larger PFS representation (15+ tables).

[CRobledo]

Here ya go:

*Heavenly Blood (Aasimar)
*Taint of the lower Planes (Tiefling)
Elemental Ancestry (Air) [Sylph]
Elemental Ancestry (Earth) [Oread]
Elemental Ancestry (Fire) [Ifrit]
Elemental Ancestry (Water)[Undine]
*Corvidblooded (Tengu)
Graveblooded (Dhampir)
Nagablooded (Nagaji)
Shadowblooded (Wayang)
Vulpineblooded (Kitsune)
Fetchling (Paizocon 2012 Grand Convocation 12+ only)
Goblin (Gencon 2012 Special pt 2 winners only)

*No longer requires a boon to play

[Harley Quinn X]

I believe, as per this post, that Dhampir and the elemental races are no longer being given out. You'd probably need to find them from someone who just had them laying around.