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.
Find the Duck’s true owner
Help a friend in need
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
No thank you ma’am
The secret’s out...
You really went and did it, huh?
Accept a smooch
Grip a Y’owl for Borbra
Find every diary page
Satisfy 15 habiticians
Dispose of the Duck
Unlock the Terrace
Discover a hidden sweetheart
Get a very high score at Whack-a-Molar
Find an alternative route
Unlock the Lounge
Unlock the Carnival
Hit Ronbo with a golf ball
Satisfy a Habitician