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