DJ Hero

Easily done on the first song of the first set. The button presses are spaced far apart, the crossfader parts are really easy and there are no "chords", even on expert.

You can ignore most of the non-button stuff (scratching, etc.) when going for this except the crossfader. You can't press the buttons if the crossfader is set incorrectly.

I don't think pressing the buttons for the scratches matters - just the tap buttons (as the achievement says).

The most easiest way that i can find to do this is to start up Boom/Tap as the whole song is full of tap notes. I found this easier to do with 2 hands on the buttons as there is no hand needed for the crossfader etc.

Just tap all the notes and its yours (Also unlocks Superstar DJ if on expert)

The easiest mix to play for this is Boom / Tap by Grandmaster Flash. It's the shortest, and has no crossfading or scratching. Put this on a custom mix and set the difficulty on Hard.

One trick about this achievement is that you can overtap, as long as you hit every note, so just focus on the easiest way of hitting every note. If you've been having problems, try this method:

For the first part, use two fingers. This part is fairly straight forward. (Boom, boom, tap.) When he gets to the break before the part with the high hat, get both hands ready on the three buttons. Make sure that if you have to hit one note, you hit all three. That way you won't have to worry about missing one. Get the beat down, and the achievement should pop in a few tries.

This method should also work for Superstar DJ. I got them both at the same time, overtapping through the mix.

i found this easy to do on the first song on the quicklist, at the same time i got few more achievements as well.plus not many platter buttons to press so made it easier than boom.tap