After the recent update. The first rock you jump on 2. You will automaticallystart getting radiation. I was still able to use this method anyway. My health is at 272. When I got out of the radition I was at a quarter health left.
This isn't a solution on how to find all the hardware. This is a solution on how to access the northwest part of the cradle that got me the achievement.
I was at 88% in the cradle and I seen some hardware over on the very northwest of the cradle. Have trying to get over there I realized that you need the Corebot that is not in the game. The T8-NK. But I managed to get over there using the FL1-R frame. And I picked up maybe 8 pieces of hardware and the achievement unlocked.
There is a lot of hardware pieces in this section. There is also a dungeon I managed to unlock the door for.
Thanks to the confirmation of Demon Haze II. You can complete this dungeon without the Tank.