The Bird Achievement in Aery - Vikings
Finish The 4th Level
How to unlock The BirdYou can access this level by completing the previous level or by selecting ‘The Bird’ from the main menu.
There are 23 crystals to collect in this level. A counter appears at the bottom-right corner of the screen after you collect the first crystal. Most of them are visible and out in the open but since there is no map, if you are having trouble locating any, refer to the video in The End (90G) (timestamps have been provided in the YouTube comments section).