Ready for RAAAAIIIIDDD?!?ing

This achievement may seem impossible at first, but I can confirm that, assuming you're within a reasonable range (don't know exact yardage), credit for roaches crushed counts across party/raid. I did this achieve with about 20 people. Just have everyone stack up and start crushing at the same time. Run in all different directions, crushing all roaches. Continue crushing until the 1 minute timer is up, because even if you may have gotten credit, your raid members might not have been so lucky. 90% or more of us got the achievement on our first try.

In short:
1. Form raid, as large as possible.
2. Stack up in the middle of Ihgaluk Crag, have the achievement tracked and wait for timer to reset.
3. When timer resets, raid warning for everyone for run in different directions and crush roaches.
4. Keep crushing for the full minute, don't stop when you get your achieve.

Guide to solo:
1.) Go to the South East entrance near the campfire with the broken sentry.
2.) Kill EVERY ROACH from the campfire area following the road up and to the left, and circling the lake on the left side. This is crucial to respawning the entire group of the roaches.
3.) Head back to the campfire area you started at.
4.) Wait ~5 minutes for the very large pack to respawn. It should hit all of the areas you knocked out earlier.
5.) Repeat your previous path. I finished this solo with 30 seconds left on one of the highest population servers there is.

After trying to get this achievement throughout the week, late at night or early in the morning, I kept coming up short.

By far the easiest way to get this achievement done is to wait for a server restart, and make sure you are standing by the Malfunctioning Silver Covenant Construct (46.59, 71.97). When the server comes back up, all of the large spawn points for the roaches will be up. Simply make a quick loop around the bonfire you start by, go up the path to the large area where Kroshik roams around the filth pool, and you should be done with an easy 20 seconds left on your timer.

This method works great if you just can not get a group together to do this achievement. Getting a group together is a lot easier, and as it has already been stated, you get credit for this while in a raid group. Another simple reminder is to be sure to track this quest in your quest log for the easy timer and how many you have stepped on already, because as soon as you step on one it starts the timer.

TL;DR Server restarts are great for soloing this one.