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