Here is the full list of all 94 Hentai Pair achievements.
I found it!
I am the best!
Level 10
10/10
9/10
Level 9
8/10
Level 8
Level 7
7/10
6/10
Level 6
5/10
Level 5
High Five
4/10
Level 4
3/10
Level 3
Level 2
2/10
Easy One
1/10
Level 1