DJ Hero 2

For this achievement you must do 4 rewinds in the same mix without dropping your multiplier.

Notes:
When performing a rewind the turntable must spin around twice (720°)

You can drop your multiplier during the song, just not during any rewind sections, your streak counter and multiplier should stay the same while you play each section the second time.

You can use any difficulty, so play on one that you feel very comfortable with.
I would also recommend playing one of the easier mixes.

i got this achievement playing Flo Rida ft Will.I.Am/Clinton Sparks, DJ Class & Jermaine Dupri (In The Ayer/Favourite DJ) on medium, the song is pretty easy, with lots of nice places with gaps for you to hit the spin nicely. I managed 5 or 6 rewinds, with a 200 note streak on this song.

hit the rewinds early. i was struggling to figure out how i was going to get this achievement, as i was only earning 2 or 3 rewinds in a song. but if you use the rewind as early as convenient, not waiting for good sections to come along, you can earn lots more

use the rewind shortly after a new section has started. that way, you are only replaying short sections of song, and are less likely to drop your multiplier

make sure you get the 720 spin. doesn't matter if you go over 720, i did some 1080s because i spun too hard. watch your turntable while it is rewinding, so you can catch it when the buttons are coming around again and start playing quickly, dont catch it when the buttons are on the other side of the board, as you're likely to screw up your multiplier.

use euphoria if you have rewound to a part of the song with crossfades, to ensure every crossfade is hit perfectly. taakes one thing off your mind while playing.

hit it four times and the achievement pops at the end of the song

Just Made 4 rewinds in any song and try not to miss any note after you make up to the place wher you start your rewind. I do it on the second block of songs from Ibiza. Easy one.

This is Best done on Beginner difficulty. I tried on Easy and Medium but the DJ Turntable I bought is not the greatest so keeping a streak is hard. But I managed to get this Achievement first try on Beginner Difficulty. Good Luck and I hope this information helps.