I've got bad news and good news. The bad news is that because the version of Cyberbots: Fullmetal Madness included in Capcom Fighting Collection is the arcade port and not one of the console ports, it only has six out of the ten pilots (arguably twleve, but the game treats the Bao & Mao as well as the unplayable Chiyomaru & Tessan pairs each as single pilots) available. The good news is that for the sake of this specific achievement, that just means you have to play through the arcade mode six times (once with each selectable) to get this achievement, with the mechs/VAs you select for each pilot not mattering here. You'll only need to select and beat the game with each of the 12 standard mechs along with the 4 secret mechs (why those mechs are available and not the pilots they're associated with is a mystery to me) if you're also going for the Collection Completionist achievement, but even then, as long as you beat the game with each of the six pilots at least once and not just use the same pilot for all 16 VAs, that shouldn't be an issue.