Stardew Valley has a "Polyculture" achievement, which reads:

Ship 15 of each crop.

However, it's not clear on what qualifies as a crop. For example, a lot of the items that can be foraged can be turned into seeds and then grown from seed - do they qualify? What about things like animal products?

2 Answers

A complete list can be found here on what needs to be shipped:

Spring:

• Parsnip
• Green Bean
• Cauliflower
• Potato
• Kale
• Garlic
• Rhubarb

Summer:

• Melon
• Tomato
• Blueberry
• Hot Pepper
• Wheat
• Radish
• Starfruit
• Hops
• Corn
• Red Cabbage

Fall:

• Eggplant
• Pumpkin
• Bok Choy
• Beet
• Yam
• Cranberry
• Amaranth
• Grape
• Artichoke

In addition, the guide also states strawberries (spring) and coffee beans (spring or summer) or also needed. A user in the comments in the guide (and here) also states that flowers are not necessary (they have been removed from the quote).

0

"Crop" is anything you can grow from its specific seed, except for flowers, ancient fruits, and sweet gem berries. The full list is:

• Cauliflower
• Coffee bean
• Garlic
• Green bean
• Kale
• Parsnip
• Potato
• Rhubarb
• Strawberry
• Blueberry
• Corn
• Hops
• Hot pepper
• Melon
• Radish
• Red cabbage
• Starfruit
• Sunflower
• Tomato
• Wheat
• Amaranth
• Artichoke
• Beet
• Bok choy
• Cranberry
• Eggplant
• Grape
• Pumpkin
• Yam