Here is the full list of all 31 Beasts of Maravilla Island achievements. It takes around 2-3 hours to unlock all of the achievements on Windows.
Beat the game for the first time
Capture all griffin behaviors
Capture all photos in the Painted Plateau
Return what was lost
Capture all unique vegetation photos in the Painted Plateau
Capture all raptor photos in the Painted Plateau
Capture all reptile photos in the Painted Plateau
Capture all gem bug photos in the Painted Plateau
Make it to the Painted Plateau
Discover the lost journal page
Capture all bat photos in the Glimmering River
Capture all otterdile behaviors
Capture all gem bug photos in the Glimmering River
Capture all unique vegetation photos in the Glimmering River
Make it to the Glimmering River
Capture all photos in the Singing Jungle
Capture all butterfly photos in the Singing Jungle
Capture all binkey behaviors
Capture all gem bug photos in the Singing Jungle
Take a selfie
Capture all bird photos in the Singing Jungle
Capture all unique vegetation photos in the Singing Jungle
Take your first photograph
Capture all photos in the Glimmering River
Capture all photos of the Island Spirit
Capture all photos
Lure all binkeys to their nests
Lure out all 3 singing binkeys
Play fetch 20 times
Capture all frog photos in the Glimmering River
Get all achievements for Beasts of Maravilla Island!