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 天
Open level 天
Pass the level 何
Open level 何
Pass the level 奈
Open level 奈
Pass the level 景
Open level 景
Pass the level 美
Open level 美
Pass the level 辰
Open level 辰
Pass the level 良
Open level 良
Pass the level "Cross"
Pass the level "Triangle"
Open level "Cross"
Open level "Triangle"
Pass the level "Square"
Open level "Square"
Pass the level "Circle"
Open level "Circle"
Pass the level 度
Open level 度
Pass the level 百
Open level 百
Pass the level 千
Open level 千
Pass the level 他
Pass the level 寻
Open level 他
Open level 寻
Pass the level 里
Open level 里
Pass the level 众!
Open level 众
Pass the level "Ban"!
Pass the level 9!
Open level "Ban"
Open level 9
Pass the level 8!
Open level 8
Pass the level 7!
Pass the level 6!
Open level 7
Open level 6
Pass the level 5!
Open level 5
Pass the level 4!
Open level 4
Pass the level 3!
Pass the level 2!
Open level 3
Pass the level 1!
Open level 2
Open level 1
Pass the level 0!
Open level 0
Pass the level @!
Open level @
Pass the level ?!
Open level ?
Pass the level !!
Open level !
Pass the level .!