Any way to get Alchemist discoveries?

[HowFortuitous]

Are there any archetypes, feats or similar that grant alchemist discoveries other than being an alchemist or an investigator?

[Avoron]

Mutation Warrior, but only from a limited list, and not until level 7.

[Helcack]

If you're looking for an extra arm then Agonizing Obedience can get you one, but only at level 16+