Here is the full list of all 50 Love Tavern achievements.
Learned 20 cooking recipes
Cook 600 dishes
Served 1500 customers
Leona's story
Complete 4 chapters of Izumi
Complete 4 chapters of Nozomi
Complete 4 chapters of Flann
Complete dungeons 50 times
Complete 4 chapters of Tamiko
Hire 10 five-star staff members
Complete 4 chapters of Toyo
Complete 4 chapters of Natsumi
Collect 1000 ingredients
Hire 30 staff members
Clean 100 times
Collect 1mil Gold
Welcome Nozomi to the tavern
Hire all unique staffs to the tavern
Welcome Nadia to the tavern
Welcome Sakura to the tavern
Welcome Leona to the tavern
Cook 120 perfect dishes
Complete 4 chapters of Lilith
Provide 100 massage services
Complete 4 chapters of Emily
Provide 100 onsen services
Provide 100 sauna services
Welcome Emily to the tavern
Build a single cleaning room
Welcome Flann to the tavern
Build a single onsen room
Build a single storage room
Welcome Tamiko to the tavern
Build a single sauna room
Welcome Lilith to the tavern
Build 40 of any type of room
Complete 4 chapters of Miwa
Welcome Miwa to the tavern
Welcome Toyo to the tavern
Hire 1 five-star staff member
Welcome Natsumi to the tavern
Build a single hunting room
Build a massage room
Earn 7777 gold
Welcome Slyvia to the tavern
Build a single dining room
Hire a staff member
Welcome Izumi to the tavern
Build a single dormitory
Build a shop