Here is the full list of all 15 Boobserman achievements.
Collect all the negative bonuses
Detonate 200 bombs
Complete the game
Detonate 100 bombs
Unlock Yumiko
Unlock Mizuki
Get caught by the censor
Unlock Aki
Collect all the positive bonuses
Get caught in the explosion
Unlock Shizuko
Unlock Naomi
Detonate 1000 bombs
Complete the game without getting caught by the censor
Complete the game without blowing yourself up