Bear in mind this is NOT cumulative. You MUST have 10,000,000 ON HAND in order for the trophy to unlock.
New players may find this total staggering, but once you beat the game, you'll be able to restart in Challenge Mode, which not only lets you keep all your bolts and restart the game but also gives you a bolt multiplier. As you kill enemies, your bolt multiplier will go up to a max of 20. Once you get hit though it returns to 1 but the multiplier will drastically increase your earned bolts. If that wasn't enough, the arena challenges and the VR challenge offer 10X as many bolts, making 10 Million bolts easily obtainable.