Here is the full list of all 16 Adrianne and Oliver achievements.
Meet your personal fitness instructor
Chat with the model for the first time
Chat with Marina's friend in the club
Meet Senka and Bogdan
Do the challenge and meet Booker
Say hi to Booker's friend
Complete the game and get ENDING 1
Complete the game and get ENDING 2
Complete the game and get ENDING 3
Complete the game and get ENDING 4
Complete the game and get ENDING 5
Complete the game and get ENDING 6
Complete the game and get ENDING 7
Complete the game and get ENDING 8
Complete the game and get ENDING 9
Complete the game and get ENDING 10