When you talk to Bourbon and he gives you a question to kill Reanimator, try to get pistol from zombies in Lower crossing. Also you will need at least 3rd level to go after Reanimator. For the start u can use Fire strike and Flame touched skills. Do not forget to gather Aetherial crystals they will be helpful for restoring devotion shrines and completing quest from Kasparov which gives you extra skill point. Even without pistol you can kil Reanimator from melee, but don't forget to use your constitution level to get out of a battle and regenerate your HP level. Don't forget to take the first devotion shrine in the cave where reanimator lives. When you return to Bourbon you'll probably receive 5th level (including Kasparov quest). Barnabas also will give your some easy xp by bringing him 5 pieces of scrap. Next you go inside Devil's crossing "town" and get quest about Milton Hart. You'll meet him while going ahead next locations by west-north side (read quest description). Before reaching unerground passage to Burrwich you should have 7th level (and there's also second devotion shrine you need). Return to town and reset all your points and learn Grenado. Then when you return to passage you'll easily kill boss guarding exit. When you get to Burwich try not to kill anyone (you should assign left mouse button Move and right button Grenado. You'll only kill some enemies in the place where Kasparov's assistant is and outside it where the third shrine is. Some more enemies you'll have to kill near the entrance to underground of Krieg's estate, because of big amount of them blocking your way. Next you'll find the fourth devotion shrine in this underground. Use 4 your devotion points to unlock Lion constellation to have extra fortitude. You'll also take most of your's stat points into physique to get more health and don't die if something goes wrong. You'll probably be near 9th level for that time. Just go through laboratory and don't focus on enemies. You can achieve 10th level (if youre not already) near Krieg's room. In his room you just run around him and throw grenado into him. You can open riftgate in his room to ensure you can return directly to him. Don't get close to him when he's on the second phase and don't get into green wave (it stuns).

1. Don't pay attention to rifts guarded by mobs. This extra time and extra experience not worthy it.
2. You shouldn't have any xp above 10th level when entering to Krieg, because the kill of Krieg gives you experience and you also will have to kill all enemies entering to Krieg's room after you.
3. I had a success after 3rd character. Pay attention to what I've noticed before. Because I had 10th level on second character and got 11 after Krieg's death and didn't receive achievement because of that.
4. Prepare some healing potions from money you already receive from selling trash.
5. Buy rings if you can, use some enchants on clothes.