Here is the full list of all 49 HARVESTELLA achievements.
Cook every kind of meal
Catch every kind of fish
Craft every kind of item
Fortify all weapons to max strength
Collect all Conellu Dolls
Overcome the last trial of the Karenoid
Complete all quests
Reach maximum closeness with everyone
Expand the farm to its max size
Rear max livestock and max bond with all
Harvest crops a total of 10,000 times
Cook HQ Pure Medicinal Porridge
Eat Dangerous Nitro Sautee at break time
Defeat every kind of FEAR
Exchange vows with a partner
Destroy all walls with bombs
Complete Chapter 10
Unlock all jobs
Max out all 4 Break Gauges
Earn over 1,000,000 Grilla from shipping
Harvest a high-quality Islet Watermelon
Complete Chapter 9
Complete Chapter 8
Complete Chapter 7
Level up your pet to its maximum level
Find all caves by digging
Expand the farm to level 3
Complete Chapter 6
Clear 10 floors of the Karenoid
Harvest crops a total of 1,000 times
Catch 20 fish in a day
Complete Chapter 5
Complete Chapter 4
Rear your first livestock
Catch 10 kinds of fish
Complete Chapter 3
Feed your pet for the first time
Collect 10 Conellu Dolls
Improve closeness 5 times
Complete 5 quests
Fortify your weapons a total of 5 times
Cook 5 kinds of meal
Defeat your first FEAR
Catch a size 10 Quotidicrab
Catch your first fish
Craft 5 kinds of item
Complete Chapter 2
Complete Chapter 1
Harvest your first crops