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