Here is the full list of all 36 Umihara Kawase Fresh! achievements.
Get all Trophies
Defeat Crabpose Blue
Get bit by the black thing
Clear 7 Challenge stages
Clear 50 Time Attack stages
Clear stages over 100 times
Clear 1 Time Attack stage
Complete Quest "c07. The Last 'WILLOW'"
Defeat Blowfish
Collect 5 travel memories
Complete Quest "75. Welcome home"
Gain access to the deep area
Gain access to the middle area2
Defeat Crabpose
30 deaths
Complete 50 Quests
Defeat Ganburian
Collection rate of at least 50% and check library
Complete Quest "33. Laplus' Letter"
Gain access to the middle area
Clear 1 Challenge stage
Defeat Big Pig
10 deaths
Can make 10 kinds of food
Unlock campers' tents
Can make 5 kinds of food
Gain access to the sky area
Collect 100 materials
Defeat Giga Tadpole
Go to the Shop
Collection rate of at least 25% and check library
Unlock camp point
Capture Pig (Cow)
1 death
Defeat Giga Tadpole's Little Sister
Complete Quest "01. Kawase's Map"