The Knowledge Achievement in Aery - Vikings
Finish The 5th Level
How to unlock The KnowledgeYou can access this level by completing the previous level or by selecting ‘The Knowledge’ from the main menu.
There are 28 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).
Note: In this level, the crystals are almost black, but against the background of the level, they are easy to see. Look for the yellowish-green glittering effect to help you identify them better.