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.
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 informations
If 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!