Here is the full list of all 31 Quickie: A Love Hotel Story achievements.
Complete Professor Belmont's Story.
Complete the Introduction!
Meet Satomi.
Meet Sara.
Meet Reika.
Meet Mai.
Meet Toshiko.
Meet Victoria.
Meet Aria.
Meet Professor Belmont.
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 Roppongi.
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 Satomi's Story.
Complete Reika's Story.
Complete Toshiko's Story.
Complete Sara's Story.