Borderlands: Game of the Year Edition

If you have all the trophy DLCs installed, then it is theoretically possible to get all the "Ding!" trophies in one Playthrough. For most people, however, it will take at least 1.5 playthroughs to get to level 50 as you won't earn enough XP on Playthrough 1 if you play legit. The highest level you're likely to reach on Playthrough 1 is approx 38, depending on how much XP grinding you do and if you have a class mod equipped that increases the amount of XP you earn. If you don't Power Level or use any exploits, then this trophy will pop around the time the Mission "Jaynistown: Getting What's Coming To You" becomes available on Playthrough 2, providing you have completed all the side-quests up to this point. Getting to level 40 isn't hard, it's getting to 50 that takes the most time as the XP gap between the two is massive. Getting to level 50 requires a total amount of 3,429,728 XP.

Here are some ways to get level 50 if you want to speed things up/cheat a little bit (though please note that we are unsure about which of these work with the PS4 version of the game and which don't):

• Go Power Levelling in the Eridian Promontory by having someone with a Max level character invite you to their game and Fast Travelling there (unless they're already at the Promontory that is). Now sit back and let the other person do all the hard work as any XP they earn, you will to - only possible in Splitscreen or LAN mode.
   
• Make sure you have the Secret Armoury of General Knoxx DLC installed then get invited to a game where someone is farming Crawmerax. Crawmerax and his minions are worth a lot of XP and you can level up extremely quickly if things go to plan
   
• If you want to cheat, then see this video on how to do the Med Kit Exploit (credit to Primalliquid):
  
  https://www.youtube.com/watch?v=-K8t0rJpxPc
  
  Note: If you use this exploit then it's best to stick to using the Dr. Ned Health Vending machine in Fyrestone otherwise it might not work properly (credit to tenike1 and levo21 for this info). This exploit works with the latest patch and the global release of the GOTY Edition so no need to delete anything, confirmed working with the JP stackable release (credit to scuzzybum for confirming this).
   
• An alternative XP Exploit is this one, which exploits a quirk with the "How much for the planet?" challenge (credit to Andy Lewis): - Doesn't work on the PS4, because of a bug that screws up the money counter.
  
  https://www.youtube.com/watch?v=cYAlyh9KTjM
  
  A full explanation for how it works can be found here: LINK (credit to Duke Briggs for this explanation). Here's an alternative way to do this exploit: To pull this off, you need to farm an area until your backpack is full then sell everything you're not using. Do this enough times and eventually (it will take a while) the money counter for "How much for the planet" will glitch and start counting backwards until it hits $9,999,999, when it hits this point you will earn 20,000 XP. Once the counter has reset, you will have sell enough items glitch it again. This exploit is extremely time consuming and should be considered a last resort option. Do note though that this exploit is not as fast nor efficient as the Medkit exploit but will do for the people that don't have the requisite Challenge available.
   
• Using Roland's Turret can cause you to lose out on XP if an enemy dies from any continuous damage it deals e.g. corrosive.
   
• Here's another exploit, you don't earn much and it's fiddly to do but it's better than nothing if you've screwed up the others (PlanetBorderlands):
  
  https://www.youtube.com/watch?v=hjw7x5kbCDM
  
  The guy doesn't mention the XP but it's there.

You really shouldn't need to use any of these exploits since you get loads of XP by just playing the game and even more by finishing all the DLCs.