Requirement: 3 Controllers Or Players (I did this with just myself pressing ""
"" on all 3 controllers when the time was right)
Level: ACT II - 5 : "Mis-Treated" (After the second boss and a "mini-game level"
After the first checkpoint (I'm not counting the one you get at the beginning of the level)
There will be a pop up on the left hand side of the screen that "Everyone Press and Hold "X" to Grind!".
All players (or yourself) needs to hold
on all their controllers and BOOM! achievement should pop the moment you are done "grinding" on the ice!