Here is the full list of all 24 Smile For Me achievements. It takes around 5-6 hours to unlock all of the achievements on Windows.
Unlock the Carnival
Hit Ronbo with a golf ball
Satisfy a Habitician
Find every diary page
Grip a Y’owl for Borbra
Discover a hidden sweetheart
Clean Kamal's teeth
Get a very high score at Whack-a-Molar
You really went and did it, huh?
Unlock the Lounge
Unlock the Terrace
Satisfy 15 habiticians
Satisfy every habitician
Find an alternative route
Help a friend in need
Dispose of the Duck
Find the Duck’s true owner
Accept a smooch
No thank you ma’am
The secret’s out...
Escape the Habitat
Leave unfinished business at the Habitat
Some crimes can’t be forgiven.
Forgive and forget.