Fast route
Do this in order
- Step 1
Progress farm upgrades until the greenhouse option appears.
- Step 2
Save the required coins and construction materials, then clear enough farm space.
- Step 3
Purchase or place the greenhouse and wait for construction to finish before checking the achievement.
Prepare before you start
Keep spare materials, coins and one free inventory row. For cumulative goals, use the collection or status menus instead of guessing from a single night.