Here is the full list of all 12 Happy Guy achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
Happy ending with Akari !
Help Akari to build the restaurant.
Meet Akari for the first time.
Run, Haro. Run...
New job with the naughty boss.
No way home.
Fasting come after feasting.
Life is not a dream.
New house, new home, new relationship.
Crypto save their life.
Discover the secret of the nurse.
Take a screenshot and the story begin.