I just did legendary survivor on a warrior after screwing up my first try I figured out some neat tricks to do it smoother.
1. Check different servers for the best ping etc. not too surprising I got best ping in europe because I live here. And allways be aware of your connection, if it gets red, hold back and wait and see if it gets green again. If it jumps alot to red, consider changing server or not level at the moment.
2. Try assisting kilroy, though you dont have to follow him, dont wait for him to come after you etc. But some times it pays of to let him die, so you have better time building adrenalin and getting healing.
3. When you get to where all the rangers are in the tunnel, pull the two carvers at the door fast, then kill 1 of them, pull 1 of the carvers which walks in the tunnel, kill 1 carver again and pull the last walker in the tunnel then kill those two. When entering tunnel kill the carver on left hand, unless you get enough adrenalin to smack the ranger on left before taking down the carver which runs towards you, basicly after that just go nuts in the tunnel.
*note pulling the carvers when they walk requires some timing and practice though, I came to the tunnel almost perfect everytime, luck or skill who cares, but you dont have to wait for them, it is possible to just go nuts and spank the whole tunnel without dying, though sometimes you get knocked out a couple times.
4. When you get to the fighting "ring" I tried never to have more than 3 on me at the time, 3 is hard enough in HM especially if you are short on adrenalin.
5. I spammed 1, 3 sometimes 2 when low on adrenalin. Allways use 7 when it gets up, ofc not on low hp mobs unless neccessary. And I allways hit 5 when it got up. On the 1st boss spam interrupt and knockdown as much as you can.
6. Last but not least, bind 8 9 and 0 to the 8th skill.
Good luck and have fun