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 an alternative route
Find the Duck’s true owner
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
The secret’s out...
You really went and did it, huh?
Get a very high score at Whack-a-Molar
Find every diary page
No thank you ma’am
Accept a smooch
Satisfy 15 habiticians
Grip a Y’owl for Borbra
Dispose of the Duck
Unlock the Terrace
Discover a hidden sweetheart
Help a friend in need
Unlock the Carnival
Unlock the Lounge
Hit Ronbo with a golf ball
Satisfy a Habitician