Here is the full list of all 18 Strange Horticulture achievements. It takes around 8-10 hours to unlock all of the achievements on Windows.
Find a Bryer's Disc location
Open the secret drawer
Activate the viewing device
Visit 20 map locations
Solve your first clue card
Identify 10 plants
Handle your first customer
Murder Burbidge
Save the Sisterhood
Create an Elixir
Bring about the Redemption
Perform the ritual
Take control of the Servant
Complete the game
Pet Hellebore 13 times
Recover from Rising Dread
Complete a full playthrough without using the hint button
Identify all the plants