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