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