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.
Craft 15 different items.
Reach the lowest level of the mines.
Upgrade your house to the maximum size.
Donate 40 different items to the museum.
Complete 10 'Help Wanted' requests.
Earn 250,000g
Cook 10 different recipes.
Catch 24 different fish.
Catch 100 fish.
Reach level 10 in a skill.
Earn 50,000g
Upgrade your house.
Ship 300 of one crop.
Catch 10 different fish.
Earn 15,000g
Earn 1,000,000g
Earn 10,000,000g
Complete the museum collection.
Reach a 5-heart friend level with someone.
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 25 different recipes.
Cook every recipe.
Craft 30 different items.
Craft every item.
Catch every fish.
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.