This is the easiest "
discover all named locations" cheevo in BL3.
I would
highly recommend to unlock most of the locations while your first playthrough since you're always near those locations while doing the main mission.
You can also do this after you beat the game. To get this achievement easier,
don't turn Mayhem Mode / True Hunter Mode on, just to get it rushed.
There is a location you can't unlock without doing a particular side mission.
*** Spoiler - click to reveal *** You will unlock this side mission eventually while playing through the main mission. While being in the cave with Typhon DeLeon you can speak to his robots near the vending machines. The gray one named Grouse wants you to help him and craft a weapon (Side mission: Cannonization). Right after that you're able to get another side mission from the exact same robot (Side mission: Bad Vibrations). Now you have to clear an air vent which causes earthquakes. You get the location after you blow up the shaft and jump into the respective hole. Those 2 missions are not time consuming, you only need about 5-10 minutes each (depends on the difficulty you set and whether you're high leveled or not)
I added a list of all those locations in Nekrotafeyo.
http://www.powerpyx.com/borderlands-3-nekrotafeyo-all-named-...credits to PowerPyx for providing those informationsIf you have trouble to unlock this achievement while you're playing co-op, try to do it solo.
Breakingbrie and
One Eyes Tigh (from the other guide, check it out!) pointed out that it didn't work for them going while playing with someone else. Thanks and credits to them for this information!