Here is the full list of all 20 Sexual Summer achievements.
13 level complete
12 level complete
11 level complete
10 level complete
9 level complete
8 level complete
7 level complete
6 level complete
5 level complete
4 level complete
3 level complete
2 level complete
1 level complete
14 level complete
15 level complete
16 level complete
17 level complete
18 level complete
19 level complete
20 level complete