Here is the full list of all 19 I Love Finding Critters achievements.
Finish the Tutorial.
Adopt a Critter.
Adopt most of the Critters (50% and above).
Adopt all Critters.
Use Hint for the first time.
Use Hint at least 10 times.
Use Hint 30x
Find a morphing object.
Find most of the morphing objects (50% and above).
Find all of the morphing objects.
Finish a butterfly puzzle.
Finish most of the butterfly puzzles (50% and above).
Finish all of the butterfly puzzles.
Have a 6x Multiplier fully deplete.
Get a Bronze Star for the first time.
Get a Silver Star for the first time.
Get a Golden Star for the first time.
Complete the 18 standard locations.
Finish all locations.