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.
Find the Duck’s true owner
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?
Find every diary page
Dispose of the Duck
Grip a Y’owl for Borbra
Accept a smooch
Satisfy 15 habiticians
Unlock the Terrace
Get a very high score at Whack-a-Molar
Discover a hidden sweetheart
Unlock the Lounge
Find an alternative route
Unlock the Carnival
Hit Ronbo with a golf ball
Satisfy a Habitician