Here is the full list of all 12 Gardener's Path achievements.
You're now a cactuses specialist!
You're now a ladybugs specialist!
You're now a sunflowers specialist!
You're now a beetles specialist!
You're now a bushes specialist!
You're now a snails specialist!
You're now a carnivorous plants specialist!
You're now a worms specialist!
You're now a mushrooms specialist!
You're now a centipedes specialist!
You're now a vines specialist!
You're now a scorpions specialist!