Mod Unlocking

[(PSN)Fear_Kazama]

I have a Riven Mod that requires 4 caches without using air support but i don't know if its sabotage or something else?.

[xiaodenden]

You can find caches in Void sabotage, Corpus and Grineer ship sabotage, and hive.  I think Earth sabotage also has caches though it's been a while since I've played that mission so I can't be 100% certain.  You don't need to find four caches in one run because the maximum number of caches per sabotage is three anyway, and as long as you don't use air support, you're good to go.

[(PSN)XxDarkyanxX]

Caches should be whatever uses the name caches in missions.. I'm thinking possibly, Sabotage or Assault. The requirement progress should save even if you change mission.
So you could find 1 cache in a first mission, and the three other in another one. ( I believe that's how it works )

Just make sure you don't hit that Air support button and you're good to go