Here is the full list of all 28 Staxel achievements.
The base game contains 23 achievements, and there is 1 DLC pack containing 5 achievements.
Catch one of every fish
Catch one of every bug
Plant 1000 Seeds
Sweep a ball
Shear a Sheep 100 times
Bake one of each Pie
Bake one of each Cake
Cook one of each Soup
Catch 100 Fish
Cook one of each Preserve
Milk a Cow 100 times
Deliver your farm registration letter to the mayor
Reap a Gold Seed
Gather 100 Shells
Gather 100 Mushrooms
Find 100 Mixed Seeds
Throw a ball
Catch 100 Bugs
Loot a forest treasure chest
Mine 1000 Raw Stone
Use a wardrobe to change your outfit!
Harvest Star Jelly
Chop 1000 Raw Wood
Harvest Grapes, Artichokes, Purple Nettle and Rhubarb
Cook Couscous and Baked Artichoke with Goats Cheese
Catch one of each fish found on the Galaxy Island
Catch one of each bug found on the Galaxy Island.
Collect Goats Milk and Brown Pheasant Feathers