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