Here is the full list of all 20 Milf City achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Complete 1 level with Kate
Complete 2 level with Kate
Complete 3 level with Kate
Complete 4 level with Kate
Complete 1 level with Lilia
Complete 2 level with Lilia
Complete 3 level with Lilia
Complete 4 level with Lilia
Complete 1 level with Sophia
Complete 2 level with Sophia
Complete 3 level with Sophia
Complete 4 level with Sophia
Complete 1 level with Mia
Complete 2 level with Mia
Complete 3 level with Mia
Complete 4 level with Mia
Complete 1 level with Bree
Complete 2 level with Bree
Complete 3 level with Bree
Complete 4 level with Bree