It's not impossible, just tough for average PvP players. I'm not great in the crucible but here are my tips on how I eventually achieved it.... 1. Don't stress it. Try and relax, if you're wound up and on a losing streak, just simply unequip TLW and you won't lose any more progress. Take a break start a new game and see if that's better. 2. Run away! If you're outgunned don't risk a death. 3. Learn to hip fire. TLW works amazingly from the hip, it took me a while to get it down, it's unnatural at first, but devastating when you get it right. 4. Streaks. Make the most of your supers and play conservatively to build up kill streaks, these will increase your progress by huge amounts. Other stuff, jump round corners, stay out of shotgun range, try and pick up heavy, fond a game mode you're good at and when you hear a hammer hitting an anvil.... Run like -Blam!- Like I say, I am average at best and I eventually got it done, persistence is the key.