I don't really know if this walkthrough can provide you that. I must tell you that if you want the exact way on how to get the highest rank - AGENT for every mission. And after that looking at Gamefaqs I found out no one have created a guide yet so here's the first attempt and hopefully other gamers will contribute or make their own as well.

I've been playing IGI2 for one week now after almost 2 months of desperately finding a way to install it and avoid crashing the game during it's intro sequence. I did this because Gamefaqs doesn't have one (yet). PRISON ESCAPE 10.PRIBOI'S VILLA 11.THE AIRFIELD 12.ZALEB'S STRONGHOLD 13.SHOWDOWN AT THE DOCKS 14.ISLAND ASSAULT 15.AIR-STRIKE 16.THE ANCIENT TEMPLE 17.SECRET WEAPONS LAB 18.MISSION CONTROL 19.THE LAUNCH PAD D. | This faq is Copyright¿ 2003 Ervin Tapas.

All other | trademarks and copyrights contained in this document are owned by their | respective trademark and copyright holders. IGI 2 is copyright¿ Codemasters/Innerloop. This document should not be used | for profitable purposes.

Igi 2 covert strike lab