Here is the full list of all 11 Hentai Harem achievements.
You completed Level 1!
You completed Level 2!
You completed Level 3!
You did what had to be done.
You completed Level 4!
You completed Level 5!
You completed Level 6!
You completed Level 7!
You completed Level 8!
You completed Level 9!
You completed Level 10! You finished the game! Time to go again?