Ghostlore

To get this achievement, you need to beat Hell depth level 1-1 to 1-5 and the boss level that come after 1-5 and all of them without dying. Die before the end and it's back level 1-1
You don't need to do it all in 1 go. You can go sell or do stuff and comeback. You can save and quit and your progress won't be lost when you log back in.
To enter a Hell depth, you need tickets. You can get those from Institute of Paranormal Studies missions. It only cost 40 tickets to enter Hell depth 1-1. I did a few missions in the institute and had over 2500 tickets in no time. Fail your Hell depth run and you'll need to pay again to re-enter.

Tips for boss level: In my run, there were 3 sections, each had 1 boss. I appeared in the middle section where the toughest boss was. I went straight to the left section and cleared it. It created a 'safe' area to wait for your skills to recharge or heal as the enemies in the middle stayed there. From there, it was easy picking as I slowly made my way right.

On this, good luck and feel free to share tips or anything I might have missed.