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