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
7/10
Level 7
Level 6
6/10
High Five
5/10
Level 5
4/10
Level 4
3/10
Level 3
2/10
Level 2
Easy One
1/10
Level 1