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