Here is the full list of all 31 Quickie: A Love Hotel Story achievements.
Complete Professor Belmont's Story.
Complete Reika's Story.
Gift all Professor Belmont items.
Gift all Mai items.
Gift all Victoria items.
Gift all Satomi items.
Gift all Aria items.
Gift all Sara items.
Gift all Toshiko items.
Gift all Reika items.
Earn the fifth star at Quickie Love Hotel in Roppongi.
Meet Victoria.
Unlock Shibuya.
Meet Aria.
Unlock Harajuku.
Meet Toshiko.
Unlock Akihabara.
Earn the fifth star at Quickie Love Hotel in Shinjuku.
Complete Satomi's Story.
Meet Mai.
Unlock Roppongi.
Meet Sara.
Meet Professor Belmont.
Complete the Introduction!
Meet Reika.
Meet Satomi.
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 Toshiko's Story.
Complete Sara's Story.