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