Here is the full list of all 20 miniBONG achievements.
The comprehensive combat power reaches 10 billion
Clear 5,000 levels
Clear 3,000 levels
Clear 1,500 levels
Completed the whole picture book
The comprehensive combat power reaches 100M
Clear 900 levels
Clear 1,000 levels
Unlock 10 illustrated books
All characters unlocked
Putting on a full costume for the first time
Clear 800 levels
The comprehensive combat power reaches 100K
Clear 700 levels
Clear 600 levels
Clear 500 levels
Clear 400 levels
Clear 100 levels
Clear 200 levels
Clear 300 levels