Here is the full list of all 25 Paperbark achievements. It takes around 4-5 hours to unlock all of the achievements on Windows.
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The Paperbark Tree
The Wetlands
The River Birds
The Bushfire
The Cool Change
A New Home
A New Home (Ending Two)
A New Home (Ending Three)
Collect all of the Yellow Albatross Butterflies
Collect all of the Gumleaf Grasshoppers
Collect all of the Blue Skimmer Dragonflies
Collect all of the Helena Gum Moths
Collect all of the Stickers
Collect all of the Green Grocer Cicadas
Eat all the food patches
Scare plenty of fairy wrens
Break a lot of sticks!
Sufficiently annoy a Spoonbill
Finish the story in under 18 minutes
Tap on all of the sounds in the sticker library
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Complete all other Steam Achievements
Find all the hidden critters