I haven't been able to find any paradropping ships. Where and when do they spawn?

Please tell me there is a sequel planned? A tank one, or drone DLC for aircraft carriers! either way love the game and want more! Thank you for reading my in depth and well thought out post.

Okay, last achievement I'm missing is the "Ram the Tripod" one. What level do they appear on? I kept my eyes open for them going through for all the treasurers, but I guess I missed them.

So I have a monitor that goes up to 180hz, and every time I I try and select a resolution that isn't 59hz, it sets me to the correct resolution but always puts it at 59hz regardless of which resolution option I click on so I'm currently stuck at a locked framerate; Was looking for perhaps if there was an ini file I could edit or something like that for a temporary solution to the problem. Cheers :)...

As per title. I have every achievement except for This is a Drill and 1 hidden achievement. Didn't get This is a Drill due to bug that has since been patched, but i wanna know what this last cheevo I'm missing is. I've beaten all the missions, collected all the treasures, for both campaign and bonus missions. What next?...