Try and find 1 or 2 more people to get the majority of them - only about 4 require a full 5 man - soloing is going to be painful, and will go faster with a partner or two.

Wowhead comments should still be useful. Nothing was changed drastically when cata came out.

I've been soloing some Wrath heroic achievements with my prot pally. I've found that it's actually easier to do them when you don't have to coordinate with others. Many of them involve holding off on DPSing, and one can control one's own dps better than a group.

Even though they are a bit outdated, the comments on WoWHead for the achievements are still generally helpful. Good luck!

The best way to get players is to set up an event for your guild, try to recruit at least 4 others, usually you can pluck a dps out of trade for the 5th one. You're going to need 5 people at least for this one:

http://www.wowhead.com/achievement=2152

Good luck! Red proto-drake is pretty sweet.

At least four others? I'd like to do Trial_oC with more than 5. Those mounted fights can't end fast enough.

Ah, but Trial of the Crusader isn't part of the Glory of the (Northrend) Hero achievement, and - as Pyromelter mentions - the red proto-drake is definitely sweet.

I wouldn't mind doing Trial of the Crusader again. I always thought it was fun. And I still hang out at the tournament and do the dailies when I'm feeling frizzed out on everything else.