!!!Update: When purchasing an original operator they will cost you 1,000 Renown. THIS WILL NEVER CHANGE (Again above guide is outdated)!!!!
1. Buy 4 Original Operators (2 attack, 2 defenders)
from the same "CTU"/ORG.
How to find what CTU/ORG the operators are in (Click spoiler):
2. Let's say I want to do the CTU "GSG 9".
I need to play 10 rounds with:Attackers: Blitz, IQDefenders: Jager, Bandit
This means you will have to play a total of 40 rounds.
I hope this helps as the guide above is pretty confusing and doesn't really explain the achievement that well...
Good luck everyone! I wish you all luck!
Achievement Info: This achievement Doesn't show your progress
It does work. So don't worry, you just won't be able to see how close you are to finishing it.