Here is the full list of all 12 Copoka achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
Return to nest
Find the smuggling cave
Collect all feathers
Collect all feathers, listen in on all major conversations and finish the story
Finish chapter 4
Finish chapter 3
Finish chapter 2
Listen in on all major conversations
Finish chapter 1
Fly high
Add a trinket to your nest
Attract attention from a walking citizen