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.
Forgive and forget.
No thank you ma’am
Find the Duck’s true owner
Help a friend in need
Leave unfinished business at the Habitat
Escape the Habitat
Some crimes can’t be forgiven.
Find every diary page
Satisfy every habitician
Clean Kamal's teeth
The secret’s out...
Discover a hidden sweetheart
You really went and did it, huh?
Accept a smooch
Satisfy 15 habiticians
Grip a Y’owl for Borbra
Dispose of the Duck
Unlock the Terrace
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