Missable achievement.
In episode 1 you need to pick up flowers in the flower shop.
In episode 2 don't feed the goat the flowers whatever you do! Also if the goat butts you you lose a random item so if you do lose them reload a save.
Finally when you need to make pot pourri for Pearl you mix eau de toilette with wood shavings. Just add the flowers to this mix and the achievement will pop.