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.
Reach level 10 in every skill.
Cook 10 different recipes.
Earn 1,000,000g
Restore the Pelican Town Community Center.
Reach a 10-heart friend level with 8 people.
Reach a 10-heart friend level with someone.
Reach a 5-heart friend level with 20 people.
Upgrade your house.
Reach a 5-heart friend level with 10 people.
Reach a 5-heart friend level with 4 people.
Catch 24 different fish.
Catch 100 fish.
Earn 250,000g
Craft 30 different items.
Complete 10 'Help Wanted' requests.
Reach the lowest level of the mines.
Donate 40 different items to the museum.
Reach a 5-heart friend level with someone.
Reach level 10 in a skill.
Catch 10 different fish.
Earn 50,000g
Ship 300 of one crop.
Craft 15 different items.
Earn 15,000g
Earn 10,000,000g
Complete the museum collection.
Cook 25 different recipes.
Cook every recipe.
Upgrade your house to the maximum size.
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'.
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.
Complete all of the Adventure Guild Monster Slayer goals.