Well i put it in and didnt get an achievement though. Might be if you beat the RSV1 story mode on elite. I never made elite online but it says "you're an elite" and yadda yadda ,get weapons and points plus rank boost - 2500 exp.
EDIT: Well it official, they fixed nothing,you wont unlock the achievement. I have 2500 xp went up to specialist but no achievement. what a stupid thing to do! its kinda like the people who glitched straight to elite on RSV1 but didnt get the achievement for ELITE.
We get reprimanded from getting that achievement for playing the 1st game and being good at it.