Here is the full list of all 14 Sakura Succubus 6 achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
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Hifumi's looking after Hazel
Hifumi pulls Stephania into a hug
Kiss HIfumi
Hear the maid's threat
The Person you've called...
Get suprised at work
Personal made alarm
Stephania is warming up to you
Call Steffy your waifu
Kiss Astoria's princess
Watch Hazel workout
Hazel won the Competition
Meet up with Ayu and Cosmos