THE KING OF FIGHTERS 2002 UNLIMITED MATCH

This achievement is actually very easy to obtain, regardless of your skill level. Just abuse macros!

1) Go to HELP & OPTIONS / OPTIONS / BATTLE SETTING and set CPU-LEVEL to 1, PLAY TIME to infinity, SINGLE ROUND to 1 and both 1P settings to max and 2P settings to minimum.
2) Go to PRACTICE MODE, pick Nameless as your character and then enter the COMMAND menu.
3) Hit EDIT and delete what's already there (Y), then enter the commands for Nameless' MAX2 move, which is DOWN, FORWARD, DOWN/FORWARD and the special S block. The S block is for multiple button presses at once and you use it by clicking it in the menu, then go right and press up until it says LP, then go right and up until it says LK, then repeat until you have LP, LK, SP, SK lined up.
4) Test your new macro by hitting RESUME GAME and pressing LT. You should see Nameless unleash a ridiculously powerful drill that covers the entire screen and does heavy damage.
5) Quit out of PRACTICE and go into ARCADE. Pick Nameless as your first character, then just whoever as your two backups as you will never use them.
6) Spam LT to win every game without ever getting hit, including against Omega Rugal. You don't even have to wait for them to get up again, just spam LT every time Nameless finishes the move to initiate it again. You can use it infinitely as long as you set your gauge to maximum in step 1.

Achievement unlocked!