Here is the full list of all 1800 Oik 4 achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
Pass the level V!
Open level W
Pass the level W!
Open level X
Pass the level X!
Open level Y
Pass the level Y!
Open level Z
Pass the level Z!
Open level .
Pass the level .!
Open level !
Pass the level !!
Open level ?
Pass the level ?!
Open level @
Pass the level @!
Open level 0
Pass the level 0!
Open level 1
Pass the level 1!
Open level 2
Pass the level 2!
Open level 3
Pass the level 3!
Open level 4
Pass the level 4!
Open level 5
Pass the level 5!
Open level 6
Pass the level 6!
Open level 7
Pass the level 7!
Open level 8
Pass the level 8!
Open level 9
Pass the level 9!
Open level "Ban"
Pass the level "Ban"!
Open level 众
Pass the level 众!
Open level 里
Pass the level 里
Open level 寻
Pass the level 寻
Open level 他
Pass the level 他
Open level 千
Pass the level 千
Open level 百
Pass the level 百
Open level 度
Pass the level 度
Open level "Circle"
Pass the level "Circle"
Open level "Square"
Pass the level "Square"
Open level "Triangle"
Pass the level "Triangle"
Open level "Cross"
Pass the level "Cross"
Open level 良
Pass the level 良
Open level 辰
Pass the level 辰