you will get this achievement for defeating the vacuum boss a second time in the last level of The Mine.
This time you need to get the yellow ability and then jump of either the small blue mushroom on the right or on the left side.
Make sure you opened the gate of the respective side before you use the mushroom bounce. In mid-air you have to use your yellow ability to attract the robots beam so the robot cuts one of the ropes. Make sure you time this right, the boss needs to stand directly below the rope (Even though it fell on his head, it did not count for me.)
After that make sure to avoid the robot after he got hit (I made an additional block in mid-air and let him pass) and continue to the other side and repeat this method.
The robot start shooting rockets at you. Avoid them! After a while you could run out of bricks to walk on. If this happens the robot will stop right before the rope and makes a jump so that new blocks fall down.Be aware that you have to wait for him to step under the rope again before you bounce off the mushroom again. The timing differs in that situation.
After the 3rd. hit the level won't be over instantly. Stay out of sight and in safety otherwise the robot will crush you with his last steps.
The achievement unlocks as soon as the cutscene starts.
If you need more help refer to the video below:
(Video Credits: Plagueis Xboxlivefr
Hope this helps you guys :-)
Any improvements? Please let me know in the comments below