Here is the full list of all 40 Stardew Valley achievements. It takes around 150-200 hours to unlock all of the achievements on Windows.
Become a Joja Co. member and purchase all the community development perks.
Earn 10,000,000g
Craft every item.
Find every stardrop.
Catch every fish.
Get married and have two kids.
Complete 40 'Help Wanted' requests.
Complete the museum collection.
Complete all of the Adventure Guild Monster Slayer goals.
Cook every recipe.
Ship every item.
Restore the Pelican Town Community Center.
Ship 15 of each crop.
Reach a 10-heart friend level with 8 people.
Cook 25 different recipes.
Reach a 5-heart friend level with 20 people.
Reach level 10 in every skill.
Beat 'Journey Of The Prairie King'.
Beat 'Journey Of The Prairie King' without dying.
Reach a 5-heart friend level with 10 people.
Reach a 10-heart friend level with someone.
Upgrade your house to the maximum size.
Cook 10 different recipes.
Reach a 5-heart friend level with 4 people.
Earn 1,000,000g
Craft 30 different items.
Complete 10 'Help Wanted' requests.
Reach a 5-heart friend level with someone.
Reach the lowest level of the mines.
Donate 40 different items to the museum.
Earn 250,000g
Reach level 10 in a skill.
Craft 15 different items.
Catch 24 different fish.
Ship 300 of one crop.
Catch 100 fish.
Upgrade your house.
Earn 50,000g
Catch 10 different fish.
Earn 15,000g