Here is the full list of all 18 Customer Cums First achievements.
Complete Chapter 18
Complete Chapter 17
Complete Chapter 16
Complete Chapter 15
Complete Chapter 14
Complete Chapter 13
Complete Chapter 12
Complete Chapter 11
Complete Chapter 10
Complete Chapter 9
Complete Chapter 8
Complete Chapter 7
Complete Chapter 6
Complete Chapter 5
Complete Chapter 4
Complete Chapter 3
Complete Chapter 2
Complete Chapter 1