Thanks dragonhunterq, just for clarity-as far as multiclassing, that is for class level or character level?
If you are a level 2 Brawler 1/Alchemist 1 then adopting a Brawler archetype counts as a level 1 "adoption" of archetype...
While we are here I may as well go the full journey-
I have a Level 2-Brawler 1(no archetype)/Alchemist 1(chirurgeon/wasteland blighter)
Would I be able to :
1. Adopt an archetype for the Brawler at its level 1 class level
2. Adopt "Sacramental Alchemist" on top of chirurgeon/wasteland Blighter since all 3 archetypes legally stack and give up the mutagen class feature for that archetype