BlazBlue: Continuum Shift

This is probably the most difficult character-specific achievement to get, but it's nowhere near impossible. As with most of these achievements, going to the Options mode and changing your timer to infinite so you won't feel rushed.

The is done easiest with two players/controllers. Go to Versus mode, and choose Tsubaki. I'm pretty sure this combo can be done against any opponent, but if it matters I chose Jin.

Once you're in the actual fight, you want to build up your Heat Gauge to at least 50%, and charge Tsubaki's unique Drive Gauge up to full (or five bars) by holding D. (Default button on the controller for this action is A.)

Once you've done that, you can begin your combo. Do this from the middle of the screen and make sure you start the combo standing as close to the opponent as possible.

214214D
623D (uppercut)
236D (while still in the air)
214D (while still in the air)
236D (after you land on the ground)
214D (you may or may not need to wait a split-second before performing this move)
22D ( you may or may not need to wait a split-second before performing this move)

If you get all these moves in and if the combo counter stays red, the achievement should pop immediately after the last move is performed.
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If you want a visual of what you're supposed to do, xzenogear1984 has a great series of videos about this game and its achievements. The video showing how to get this achievement is included below. Skip to 3:22 for the portion about this combo.

Good luck and happy hunting!

For this achievement you have to use the 'D' version of every single special attack of Tsubaki in a combo. Note that it needs to be a "Real Combo" (numbers in the corner of the screen will be red. If they turn out blue it means you dropped the combo)
Your Heat Gauge needs to be at least in 50%. Tsubaki's Dive Gauge must be at level 5 (press and hold D to fill this bar).

For anyone who is struggling with any of the presented combos, try this one:
(in corner) 214214D, 22D, 214D, 236D, 623D, j.236D, j.214D

After trying other combos several times I managed to pull this one out and I think it's quite easy since you don't need to worry delaying any move, it just go in one single flow.

Thanks for the guide and it did work well :). However, I just wanted to point out that if you have downloaded the latest 1.03 update for Blazblue CS that you will need to change it to an older system version for the aforementioned guide to work. This is because Tsubaki's 214D (while still in the air) has a steeper decline in the new update and lands one less hit than it used to which doesn't allow for the required 15 hits for the achievement to unlock. I changed it to 1.01 and it worked for me.

Go into versus mode with Iron Taggart with verion 1.01
round time to unlimited

Pick Tsubaki (not beginner mode)
with your second controller start wailing on Tsubaki and get her heat to at least 50%. (you'll have to block a bit)

get taggart in your right side corner and you're going to be facing him

to sum it up we're going to start with the aerial and end with the shield charge

(Corner taggart and you're facing him) HitGauge 50%

214214D (fancharge:IT GIVES YOU UNLIMITED D MOVES) -
623D (shoryuken) 236 projectile - 214 dive
(AS SOON AS YOU LAND ON THE GROUND) 22d (pops them up a bit) -
214d (sword uppercut) - 236 d (shield charge to finish)