There was another thread (made by LickableLemons) about Nak3dHalo's speedrun videos and I really think a link to those should be added to the legendary solo achievement as he lets you know a lots of great ways to get through legendary solo!
Here's the link that was in the other thread:
I don't know if there is a playlist for all of them but they are easy to find from that link.
Ps. Very good guide!