It's a long and tough road to 100%. I've already sank in a hundred hours and I'm not even halfway done. I've halted progression in the campaign to set myself up for the finish line. I've completed all available side ops and I'm trying to S rank my previous missions and complete all tasks. Even though I'm only on Mission 24, I'm already seeing S rank soldiers in the field and I'm pulling them from completing main story missions. I haven't even broken 200k heroism.
Right now, I'm in the process of farming materials. I've got a severe shortage of fuel and common metals, even with a FOB. I'm going to farm as many materials as I can and see how far I can S rank missions without hitting a development wall. The only thing stopping me right now are specialist skills that I'll have to pick up during the campaign.
Once I get the ball rolling, I should cruise pass the 100% mark comfortably. I'm confident it won't take another 100 hours to get there. Once I research the highest levels of equipment, I should be able to break the game at my leisure. The only thing that worries me is capturing animals. Everything else I can brute force. Capturing animals is pretty RNG, and I'm getting terrible flashbacks to Peace Walker where I had to grind AI pods to make the perfect Metal Gear.
The things I do for gaming...