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