Ghostbusters: Spirits Unleashed Ecto Edition

This a multiple achievement guide, but primarily this is the best way to earn Profile and Ghost XP at once.

Seasoned - Reach Level 50
Ghost Expert - Fully Level up a Ghost Class

Guide:
Go into the Ghost Realm from the Firehouse
Select preferred ghost. The starting ghost is most ideal for area damage.
Start a game on Clocktower

Immediately head for the Ghostbusters entrance - Head as straightforward as possible when the round starts.
Get all the Busters together as often as possible.
- This should be easier the quicker you arrive. -

Down one Buster and the others should quickly group together to keep reviving.

Stay close and keep hitting them with RT basic attacks repeatedly
Whenever your abilities become available use each of them.

Using the area damage attacks will ease knocking them back down once they're up but you shouldn't have a problem.

When all Busters are down at once you should use this downtime to knock out as many Proton Pack Sabotages as you can. This isn't totally necessary but will result in more time to keep the flow of knocking down the busters and will quickly net you the diabolical achievement as a result.

All your attacks and tether-breaking will earn you lots of XP - Watch this stack on the left and you will get over 50,000 xp per run and huge level-ups


The Following 9 achievements can also be naturally gained in this process:



Line em' up - Pass through all 4 busters within a 3-second window
When all Busters are grouped you can attempt to pass through them here, this would be a better method than playing naturally, as I found this to be quite difficult in my normal playtime.

I don't need these - Detonate all 3 of your rifts during 1 match and still win
If you collect and drop your rifts, then detonate them with B before doing one of these rounds then you could easily net this achievement on top.

Pick Slimer as the ghost

Go to Museum vs bots.

Go to the 2 raptors dinosaurs and haunt them.

Go above and possess the tetradactyl bird looking dinosaur.

Wait for bots to line up by the railing,

Slime them all at once with your ultimate ability.

This should down them giving you enough time to pass though all 4 bots 2 or 3 times in case you miss one.

--- Note that buster AI has been updated since this post making this method harder to get --- If all else fails consider making a full boosting group.

@Greedy136 adds

I confirm that all four busters have to stand. If one is down, it does not count. Most likely, the busters have to take damage to count and they are basically invincible when down.

I tried a few things to get them grouped in the same room. I even placed two open rifts on a staircase, but that only attracts one or two of them. With the current AI, the best solution is to down one buster. The RB attack of Slimer works great. The other three busters will run to their friend.

I recommend to down a few more with the RT attack that has closer range but easily hits multiple busters. It is possible, but rare, that four busters are downed at the same time. They would recover at the same time. That is not required. It is fine to have maybe two busters down and two others helping their friends. Just wait for the moment, when all four are standing. The best would be, if they are in line. You may down the remaining busters, if you do not like how they are grouped (e.g., when one is too far away from the group). Just give them a few seconds to regroup and then down them again. The busters will be too busy helping their friends. They may not care about you.

If you mess up, just start again with downing one buster. The Y attack may down the whole group, but they will end up in a unfortunate formation. Always start with one (RB attack). You should also rest in an object to recover your energy whenever possible.