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