Here is the full list of all 19 Synthetic Lover achievements.
Get all the main 18 achievements of the Synthetic Lover Game
Romance Bastian and Terrance, and make out with Karim
Romance Terrance
Unlock all endings in the game
Get Bastian and Terrance to touch your body with their bare hands in a casual way
Get both Friendship Endings
Politely refuse an offering of food
Finish both routes without romancing or becoming close with the two main love interests
Claim that gender identity isn’t important to you
Romance Bastian
Fly on a hoverbike
Watch your companion impress a lady
Avoid making Bastian uncomfortable when in bed together
Conceal Bastian’s real name
Make sure Bastian’s doesn’t suffer at the hands of the thugs
Get a new biot designation number
Push the limit bargaining with the Biotech but make sure Bastian survives
Experience death early in the game
Play through the entire common route of the game