Here is the full list of all 30 Quickie: A Love Hotel Story achievements.
Meet Sara.
Meet Mai.
Unlock Roppongi.
Complete Reika's Story.
Complete Satomi's Story.
Meet Professor Belmont.
Complete the Introduction!
Meet Reika.
Meet Satomi.
Meet Toshiko.
Meet Victoria.
Meet Aria.
Gift all Satomi items.
Gift all Sara items.
Gift all Reika items.
Gift all Mai items.
Gift all Toshiko items.
Gift all Victoria items.
Gift all Aria items.
Gift all Professor Belmont items.
Unlock Akihabara.
Unlock Harajuku.
Unlock Shibuya.
Earn the fifth star at Quickie Love Hotel in Shinjuku.
Earn the fifth star at Quickie Love Hotel in Roppongi.
Earn the fifth star at Quickie Love Hotel in Akihabara.
Earn the fifth star at Quickie Love Hotel in Harajuku.
Earn the fifth star at Quickie Love Hotel in Shibuya.
Complete Professor Belmont's Story.
Complete Toshiko's Story.