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