2 archetypes, from Inventor to Investigator.
ARCHETYPE
You revel in the creation of clever inventions, deploying your brilliance to defeat your foes. Explosives, gadgets, and innovative technologies? You have ideas for all of them, and you're eager to test your theories.
Multiclass Inventor characters
Inventor is a great fit for intelligent characters looking to branch out and learn new tricks, especially alchemists, who are already good at Crafting and may appreciate unstable options as an alternative to daily alchemical resources. If they meet the Intelligence requirements, clerics of deities who encourage invention and experimentation like Thousteton are an amazing fit, both because it makes narrative sense and because such characters can usually Refocus while fixing their innovation after using an unstable ability.
Guns & Gears, page 49.
ARCHETYPE
You've developed a keen eye for investigating mysteries.
Multiclass Investigator characters
The investigator archetype is a good choice for a character that wants deeper investigations or to plan out their turns in advance; it's a particularly good match for Intelligence-based characters like alchemists, witches, and wizards.
Advanced Player’s Guide, page 151.