A Good Day to Dye Hard

Pre-requisites:

1. 
   
2. Clear bosses 1 to 5 as normal.
3. 
   
4. Clear trash around the [npc=231945] inside the Gallagio (DO NOT LOOT THIS).
   /way #15522 60.10 50.69 Purple Casino Chip
5. 
   
6. Clear trash up to [npc=228458].
7. 
   

You are now ready to start the achievement:

1. 
   
2. Head back to the [npc=231945] inside the Gallagio (DO NOT LOOT THIS).
   /way #15522 60.10 50.69 Purple Casino Chip
3. 
   
4. Stack all players in the raid group ontop of the coin.
5. 
   
6. Wait for a splash animation from the fountain to land on the group.
7. 
   
8. You will receive a buff called [spell=1213796].
   Note - You cannot receive [spell=1213796] if [npc=228458] has already been defeated.
   You now have 20 minutes. Nobody in the group can die.
9. 
   
10. Defeat [npc=228458] and [npc=229953].
    OR
    If you have completed Liberation of Undermine: Splitting Pairs, you can back-track to the raid entrance, talk to [npc=235619] and get transported to the 'Tower of Spades'. This will skip the need to kill [npc=228458] and allow you to go directly to [npc=229953].
11. 
    

When [npc=229953] dies, if everyone still has [spell=1213796], the achievement will pop.

Good luck!

For the achievement, You do not press the Purple coin as you would for Best in Class.
You need to stand next to the coin and wait for the splash for the dye - [spell=1213796]
Or you can stand on the otherside and take green dye.

Then you have to kill Bandit + Mugzee without dying, The buff stays for 20min.

This can be done with less than 10 players. Confirmed today in a 3-man group.