There are 8 achievements in the game tied to reaching levels 5, 10, 20, 30, 40, 50, 51 and 61 and from your first playthrough you will be at around level 32-34 and after doing the DLC possibly close to level 55 (As you will need to be levelled high for the DLC)
So for the remaining grinding there is a cheeky method to get easy XP
providing you have not already completed the challenge called 'Merchant of Death' which is to sell 1200 items which gives you 20,000XP. You can check if you have/have not completed this by pressing
and scrolling with
/
to the 'Mission Log' and press
on that to switch to the 'Challenge Log',
scrolls down.
Firstly you need to travel to an area with a vending machine close by, Arid Badlands works well for this, now you need to sell enough items so that you have sold 1,199 items total. An easy way to grind this is to buy healing kits from the Med Vending machines and sell them.
Now press
and save and exit.
Reload back in and go to the vending machine and Sell one item and
then 'buy back' that item which is important. Now when you exit the vending machine the challenge will complete and give you 20,000XP BUT the challenge has not actually completed as you bought the item back.
Now you can press
and save and exit, then reload back in and repeat the process of selling an item and
buying it straight back and exiting the vending machine. Keep doing this until you have enough XP.
The XP levels are:
• Level 5 - 5,376
• Level 10 - 37,798
• Level 20 - 263,595
• Level 30 - 820,463
• Level 40 - 1,836,137
• Level 50 - 3,429,728
• Level 51 - 3,625,271
• Level 61 - 5.985,086
The 8 achievements are