This guide shows you how to get the Acidic alchemy trophy
step 1 - gather the 3 acid trap parts, first complete 3 challenges from challenge banner which will get you the pot and the 2 other parts are in the temple cog and chain
step 2 - build the acid trap in a craftable location and get at least one zombie kill from it
step 3 - start a new game and build in a different craftable location (ra tower entrance, danu tower entrance, odin tower stairs and zeus tower stairs)
