Here is the full list of all 18 Aviarium achievements.
The base game contains 0 achievements, and there is 1 DLC pack containing 18 achievements.
Obtain your first bird.
Sell a bird for the first time.
Obtain a Golden variant bird.
Obtain a Rainbow variant bird.
Reach 1,000,000 coins.
Spend a total of 100,000 coins.
Create a cozy, well-decorated aviary.
Obtain a Rare (or higher) bird.
Obtain an Ancient bird.
Discover 25 unique species.
Play for 1 hour.
Play for 5 hours.
Play for 10 hours.
Reach 1,000 coins daily income.
Own 10 birds within 30 minutes.
Name 100 birds
Feed birds 1,000 times.
Place 10 decorations