Here is the full list of all 2230 Oik Memory 2 achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Destroy the square
Pass the level 9!
Go to the settings menu
Pass the any timed level
Learn the tutorial
Pass the level 8!
Open level 9
Open all levels
Pass the level 7!
Open level 8
Pass the level 6!
Open level 7
Pass the level 5!
Open level 6
Pass the level 4!
Open level 5
Pass the level 3!
Open level 4
Pass the level 2!
Open level 3
Pass the level 1!
Open level 2
Pass the level 0!
Open level 1
Pass the level 然!
Open level 0
Pass the level 惘!
Open level 然
Pass the level 已!
Open level 惘
Pass the level 时!
Open level 已
Pass the level 当!
Open level 时
Pass the level 是!
Open level 当
Pass the level 只!
Open level 是
Pass the level 忆!
Open level 只
Pass the level 追!
Open level 忆
Pass the level 成!
Open level 追
Pass the level 待!
Open level 成
Pass the level 可!
Open level 待
Pass the level 情!
Open level 可
Pass the level 此!
Open level 情
Pass the level Z!
Open level 此
Pass the level Y!