This Cheevo is unlocked during The Day 1 Dream. You experience this dream when you fall asleep for the First time. This will likely be at Lara's House.
When you start the Dream. Talk to all 3 guys with masks. Then turn around and talk to the Executor.
Now you will see 3 enemies. You must let them kill you for the Achievement🏆
Here is my Video Walkthrough for Day 1:
(Time Stamp: 20:27)