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