Kill 100 enemies while using the Last Stand perk.
There's no porcupine emblem... the closest thing to that is a squirrel, a badger, some hyena like creature, and a bear. Sorry.
There is no porcipine emblem. You probably got it mixed up with the badger or something. I can't answer this since I don't know what you're referring to.
No
You cant.
It is impossible to get the 10th Prestige moving emblem on Call of Duty: Modern Warfare 2. Infinity Ward made this to catch hackers red handed. That's why you must hack to the get the emblem.
It is unlocked at level 69.
2nd prestige
Nothing they are the first emblem you unlock.
Get a "Payback" by sticking a Semtex on an enemy
Get a "Payback" by sticking a Semtex on an enemy
A new emblem and 10 different custom classes.
Call in 50 Pave Lows.