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