Here is the full list of all 10 Resort "Waifu Bay" achievements.
Upgrade the hotel to the maximum
Upgrade the parking lot to the maximum
Upgrade the swimming pool to the maximum
Upgrade the spa to the maximum
Upgrade the sports ground to the maximum
Upgrade the harbour to the maximum
Upgrade the beach to the maximum
Upgrade the café bar to the maximum
Get 7 stars
Get 1 star