Warning: this achievement will take a very long time and is incredibly difficult. Only the most dedicated and skilled gamers will have the ability to unlock this achievement, which I honestly expect to carry a TA ratio of at least 30. Completionists who are Borderlands enthusiasts (such as myself) will cry themselves to sleep for years to come knowing that Borderlands 2 will likely have permanently ruined their otherwise perfect/near-perfect completion percentage.
This achievement is pretty much a combination of
So even if you're dedicated enough to grind for hundreds- nay, thousands of hours, the insane difficulty will keep all but the godliest gamers from ever popping this achievement.
The requirements for this achievement are self-explanatory and no step-by-step guide that I could assemble would possibly help. If you really want this achievement, the I suggest you try to forget all about it, play the game normally, and hope for the best.
Godspeed, vault hunters!