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