The Hunter Achievement
Complete all bonus levels
Each of the chapters have 3 bonus levels that will become available once you collect all of the safkas in that chapter. Each of the bonus levels per chapter correspond to a certain color safka, and once that color safka is fully collected from that chapter it will become available. The bonus levels are large and will take more time than some normal levels, so feel free to check Youtube if you are stuck and need help. Complete all the bonus levels for this to unlock.