LOL! Aweesome game! To achieve the 100kx Combo just put a line of Buzzsaws and a cover the entire roof with Turret. Also put Launcher on the floor and 2 Sentinels near the corner and upgrade all the Valves at least to level 4. And that's your achievement. xD 4/5
Ehm.. I'm sorry for the comment I wrote.. I've just realized that if I want more insect I can use "Distress Call".. It really gives you some problem if you don't have Laser Cannons.. XD
Anyway, for the "Mission Impossible" achievement you don't have to upgrade your Holy Fruit.. But only the main cannon or all?