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