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