Here is the full list of all 100 Hentai Gothic Girl achievements.
Complete Level 1 Easy
Complete Level 1 Hard
Complete Level 2 Easy
Complete Level 2 Hard
Complete Level 3 Easy
Complete Level 3 Hard
Complete Level 4 Easy
Complete Level 4 Hard
Complete Level 5 Easy
Complete Level 5 Hard
Complete Level 6 Easy
Complete Level 6 Hard
Complete Level 7 Easy
Complete Level 7 Hard
Complete Level 8 Easy
Complete Level 8 Hard
Complete Level 9 Easy
Complete Level 9 Hard
Complete Level 10 Easy
Complete Level 10 Hard