The red one is actually probably the easiest to get... having a snoop on your armoury, I can see you only need a few more...
Split Personality - Easy, needs a bit of co-ordination, get the images to a low level and AoE them down
Intense Cold - Very Easy, all keep moving
Chaos Theory - Very Easy, just don't use any AoE and ignore adds
Watch him die - Moderate, though easy if OP - Zerg
Respect your Elders - Moderate, 2 tanks needed, have the other guy take the boss as far in the corner where he starts, you pick up add on the other side of the chamber
Share the love - Easy, but annoying, need a 2nd tank. Tank bare knuckle no DPS, till other 4 are impaled, swap tanks till you're up and then burn him down. This can take AGES. If a DPS dies and he's already been impaled, just let him stay dead, still gets it. And it expressly says 5 so you'll need a full group.
Abuse the Ooze - Easy, let the oozes merge, kill a few of them
Zombiefest! - was Very Easy, apparently they've nerfed it so you can't tow them all down to the bottom. But the way we did it, clear till last outside boss, then DON'T kill any zombies, best to kite boss to town hall steps before killing, once he's down zombies stop spawning. Carry on inside until just before the run at the bottom of the stairs with all the fire. Tank go fetch ALL the zombies (sense undead helps), tow back to the group, AoE down and pick up any others you need in the tunnel. Can probably solo it. Turn the track tick on and you can keep count.
Experienced Drake Rider - Easy, just ride the different drakes
Amber Void - Easy, use 2 Green 3 red or 3 Green 2 Red- make sure you're on one of the Greens for Experienced.
The only thing you can't definitely get in one day is Chaos Theory as it's down to luck whether or not you get the right boss in Violet Hold.