You can complete Achievements by playing Devil Book.
■ Achievement Level
① Tap the 'Menu' icon (=).
② Tap on'Achievement'.
③ You can check your current Achievement Level.
④ You can check your current Achievement situation.
⑤ You can obtain rewards, Diamonds, Achievement EXP, and gold.
⑥ Two stat option, Critical and Evasion, increases when your Achievement Level increases.
When you complete an Achievement, you will get the additional Achievement EXP.
When Achievement EXP reaches 100%, the Achievement Level is increased.
※ The guide was produced in a separate test environment.
So, It may change depending on the update and development situation.
Thank you for your love and interest in the Devil Book~
Devil Book Team