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