Here is the full list of all 19 Suspect Enemy achievements.
Kill your first victim
Complete your first task
Complete 10 tasks
Complete 50 tasks
Complete 100 tasks
Complete 500 tasks
Complete 1000 tasks
Complete 10000 tasks
Die 10 times
Die 50 times
Die 100 times
Die 500 times
Die 1000 times
Visit the other world for the first time
Kill 10 crewmate
Kill 50 crewmate
Kill 100 crewmate
Kill 500 crewmate
Kill 1000 crewmate