At the start of the level, once you reach the top of the first wall you have to climb, if you look to the left of you, you'll see a "glitched" scroll quickly pop on screen and then disappear. Jump to the left and use your special ability (push RT or LT) to disappear and reappear on the scroll. You'll turn into the scroll but in order for the achievement to unlock, you'll have to complete the level as the scroll.
Jump back over to the first wall and shoot a knife into the brown wall to your right and jump on that knife by using your special ability and holding right as you jump. Wait for the lava to recede and drop to the bottom, disappearing past the blades and climb up the second wall, shooting another knife into the brown wall and jumping on it until the lava recedes again. Fall down, disappear past the laser and grab the Green Suit and double jump your way up the third wall, in which you'll see the Collectable of the level to your right.
After getting the double jump ability (Green Suit), it's just a matter of going back to the left, double jumping up to the higher platforms where only an enemy ninja and a couple of saw blades stand between you and the achievement.