[MarcusHawkins]

Originally Posted by DDRNGGin

Here is the full song list of DDR/IIDX remixes regarding my 3rd achievement:

4F73R M3
NeoMAX
MAX Forever
R3 (Omega Mix)
Paranoia ~Darkness Mix~
MaxX AttaxX
AAA
StarmineX -HappyHyperStarmiX (Not sure if it is from Beatmania or not)
Xeno-Flow
Vanity Angel (Seraphim Mix)
AM-3P (House Party Dub)
Lapis -The Heavens Remix
Fly Away -mix del matador
LUV TO ME 2011
EternuS (From DDR SuperNova 2 CS US)

EternuS is the only DDR/IIDX card that is optional to acquire.

If I have left out any DDR/IIDX Remixes or if a song on the list is not a DDR/IIDX Remix, please let me know.

Not sure if it counts, but Z by DM Ashura.
For one it has the BPM and "musical feel" of the MAX series.
It also resembles the artist cover name of a couple MAX songs which are Z and ZZ. Finally, it can relate really well to the other boss songs by DM Ashura in the StepMix 1 time-frame like Z that you listed which are NeoMAX, MaxX AttaxX, and MAX Forever.

EDIT: I just remembered the song 5.1.1. (AG Supercool Mix) which is a remix of 5.1.1. by dj nagureo in DDR 2nd ReMIX APPEND CLUB VERSION Vol.1 CS JP...
...And you forgot that song!!
FUN FACT: It's also the first song in the song-list of that particular game! Pretty neat, huh?